diff --git a/lib/cie.js b/lib/cie.js
new file mode 100644
index 0000000..45f0132
--- /dev/null
+++ b/lib/cie.js
@@ -0,0 +1,155 @@
+(function(d3) {
+  var cie = d3.cie = {};
+
+  cie.lab = function(l, a, b) {
+    return arguments.length === 1
+        ? (l instanceof Lab ? lab(l.l, l.a, l.b)
+        : (l instanceof Lch ? lch_lab(l.l, l.c, l.h)
+        : rgb_lab((l = d3.rgb(l)).r, l.g, l.b)))
+        : lab(+l, +a, +b);
+  };
+
+  cie.lch = function(l, c, h) {
+    return arguments.length === 1
+        ? (l instanceof Lch ? lch(l.l, l.c, l.h)
+        : (l instanceof Lab ? lab_lch(l.l, l.a, l.b)
+        : lab_lch((l = rgb_lab((l = d3.rgb(l)).r, l.g, l.b)).l, l.a, l.b)))
+        : lch(+l, +c, +h);
+  };
+
+  cie.interpolateLab = function(a, b) {
+    a = cie.lab(a);
+    b = cie.lab(b);
+    var al = a.l,
+        aa = a.a,
+        ab = a.b,
+        bl = b.l - al,
+        ba = b.a - aa,
+        bb = b.b - ab;
+    return function(t) {
+      return lab_rgb(al + bl * t, aa + ba * t, ab + bb * t) + "";
+    };
+  };
+
+  cie.interpolateLch = function(a, b) {
+    a = cie.lch(a);
+    b = cie.lch(b);
+    var al = a.l,
+        ac = a.c,
+        ah = a.h,
+        bl = b.l - al,
+        bc = b.c - ac,
+        bh = b.h - ah;
+    if (bh > 180) bh -= 360; else if (bh < -180) bh += 360; // shortest path
+    return function(t) {
+      return lch_lab(al + bl * t, ac + bc * t, ah + bh * t) + "";
+    };
+  };
+
+  function lab(l, a, b) {
+    return new Lab(l, a, b);
+  }
+
+  function Lab(l, a, b) {
+    this.l = l;
+    this.a = a;
+    this.b = b;
+  }
+
+  Lab.prototype.brighter = function(k) {
+    return lab(Math.min(100, this.l + K * (arguments.length ? k : 1)), this.a, this.b);
+  };
+
+  Lab.prototype.darker = function(k) {
+    return lab(Math.max(0, this.l - K * (arguments.length ? k : 1)), this.a, this.b);
+  };
+
+  Lab.prototype.rgb = function() {
+    return lab_rgb(this.l, this.a, this.b);
+  };
+
+  Lab.prototype.toString = function() {
+    return this.rgb() + "";
+  };
+
+  function lch(l, c, h) {
+    return new Lch(l, c, h);
+  }
+
+  function Lch(l, c, h) {
+    this.l = l;
+    this.c = c;
+    this.h = h;
+  }
+
+  Lch.prototype.brighter = function(k) {
+    return lch(Math.min(100, this.l + K * (arguments.length ? k : 1)), this.c, this.h);
+  };
+
+  Lch.prototype.darker = function(k) {
+    return lch(Math.max(0, this.l - K * (arguments.length ? k : 1)), this.c, this.h);
+  };
+
+  Lch.prototype.rgb = function() {
+    return lch_lab(this.l, this.c, this.h).rgb();
+  };
+
+  Lch.prototype.toString = function() {
+    return this.rgb() + "";
+  };
+
+  // Corresponds roughly to RGB brighter/darker
+  var K = 18;
+
+  // D65 standard referent
+  var X = 0.950470, Y = 1, Z = 1.088830;
+
+  function lab_rgb(l, a, b) {
+    var y = (l + 16) / 116, x = y + a / 500, z = y - b / 200;
+    x = lab_xyz(x) * X;
+    y = lab_xyz(y) * Y;
+    z = lab_xyz(z) * Z;
+    return d3.rgb(
+      xyz_rgb( 3.2404542 * x - 1.5371385 * y - 0.4985314 * z),
+      xyz_rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z),
+      xyz_rgb( 0.0556434 * x - 0.2040259 * y + 1.0572252 * z)
+    );
+  }
+
+  function rgb_lab(r, g, b) {
+    r = rgb_xyz(r);
+    g = rgb_xyz(g);
+    b = rgb_xyz(b);
+    var x = xyz_lab((0.4124564 * r + 0.3575761 * g + 0.1804375 * b) / X),
+        y = xyz_lab((0.2126729 * r + 0.7151522 * g + 0.0721750 * b) / Y),
+        z = xyz_lab((0.0193339 * r + 0.1191920 * g + 0.9503041 * b) / Z);
+    return lab(116 * y - 16, 500 * (x - y), 200 * (y - z));
+  }
+
+  function lab_lch(l, a, b) {
+    var c = Math.sqrt(a * a + b * b),
+        h = Math.atan2(b, a) / Math.PI * 180;
+    return lch(l, c, h);
+  }
+
+  function lch_lab(l, c, h) {
+    h = h * Math.PI / 180;
+    return lab(l, Math.cos(h) * c, Math.sin(h) * c);
+  }
+
+  function lab_xyz(x) {
+    return x > 0.206893034 ? x * x * x : (x - 4 / 29) / 7.787037;
+  }
+
+  function xyz_lab(x) {
+    return x > 0.008856 ? Math.pow(x, 1 / 3) : 7.787037 * x + 4 / 29;
+  }
+
+  function xyz_rgb(r) {
+    return Math.round(255 * (r <= 0.00304 ? 12.92 * r : 1.055 * Math.pow(r, 1 / 2.4) - 0.055));
+  }
+
+  function rgb_xyz(r) {
+    return (r /= 255) <= 0.04045 ? r / 12.92 : Math.pow((r + 0.055) / 1.055, 2.4);
+  }
+})(d3);
diff --git a/lib/hive.js b/lib/hive.js
new file mode 100644
index 0000000..06e53ae
--- /dev/null
+++ b/lib/hive.js
@@ -0,0 +1,80 @@
+d3.hive = {};
+
+d3.hive.link = function() {
+  var source = function(d) { return d.source; },
+      target = function(d) { return d.target; },
+      angle = function(d) { return d.angle; },
+      startRadius = function(d) { return d.radius; },
+      endRadius = startRadius,
+      arcOffset = -Math.PI / 2;
+
+  function link(d, i) {
+    var s = node(source, this, d, i),
+        t = node(target, this, d, i),
+        x;
+    if (t.a < s.a) x = t, t = s, s = x;
+    if (t.a - s.a > Math.PI) s.a += 2 * Math.PI;
+    var a1 = s.a + (t.a - s.a) / 3,
+        a2 = t.a - (t.a - s.a) / 3;
+    return s.r0 - s.r1 || t.r0 - t.r1
+        ? "M" + Math.cos(s.a) * s.r0 + "," + Math.sin(s.a) * s.r0
+        + "L" + Math.cos(s.a) * s.r1 + "," + Math.sin(s.a) * s.r1
+        + "C" + Math.cos(a1) * s.r1 + "," + Math.sin(a1) * s.r1
+        + " " + Math.cos(a2) * t.r1 + "," + Math.sin(a2) * t.r1
+        + " " + Math.cos(t.a) * t.r1 + "," + Math.sin(t.a) * t.r1
+        + "L" + Math.cos(t.a) * t.r0 + "," + Math.sin(t.a) * t.r0
+        + "C" + Math.cos(a2) * t.r0 + "," + Math.sin(a2) * t.r0
+        + " " + Math.cos(a1) * s.r0 + "," + Math.sin(a1) * s.r0
+        + " " + Math.cos(s.a) * s.r0 + "," + Math.sin(s.a) * s.r0
+        : "M" + Math.cos(s.a) * s.r0 + "," + Math.sin(s.a) * s.r0
+        + "C" + Math.cos(a1) * s.r1 + "," + Math.sin(a1) * s.r1
+        + " " + Math.cos(a2) * t.r1 + "," + Math.sin(a2) * t.r1
+        + " " + Math.cos(t.a) * t.r1 + "," + Math.sin(t.a) * t.r1;
+  }
+
+  function node(method, thiz, d, i) {
+    var node = method.call(thiz, d, i),
+        a = +(typeof angle === "function" ? angle.call(thiz, node, i) : angle) + arcOffset,
+        r0 = +(typeof startRadius === "function" ? startRadius.call(thiz, node, i) : startRadius),
+        r1 = (startRadius === endRadius ? r0 : +(typeof endRadius === "function" ? endRadius.call(thiz, node, i) : endRadius));
+    return {r0: r0, r1: r1, a: a};
+  }
+
+  link.source = function(_) {
+    if (!arguments.length) return source;
+    source = _;
+    return link;
+  };
+
+  link.target = function(_) {
+    if (!arguments.length) return target;
+    target = _;
+    return link;
+  };
+
+  link.angle = function(_) {
+    if (!arguments.length) return angle;
+    angle = _;
+    return link;
+  };
+
+  link.radius = function(_) {
+    if (!arguments.length) return startRadius;
+    startRadius = endRadius = _;
+    return link;
+  };
+
+  link.startRadius = function(_) {
+    if (!arguments.length) return startRadius;
+    startRadius = _;
+    return link;
+  };
+
+  link.endRadius = function(_) {
+    if (!arguments.length) return endRadius;
+    endRadius = _;
+    return link;
+  };
+
+  return link;
+};
diff --git a/lib/horizon.js b/lib/horizon.js
new file mode 100644
index 0000000..d84c656
--- /dev/null
+++ b/lib/horizon.js
@@ -0,0 +1,192 @@
+(function() {
+  d3.horizon = function() {
+    var bands = 1, // between 1 and 5, typically
+        mode = "offset", // or mirror
+        interpolate = "linear", // or basis, monotone, step-before, etc.
+        x = d3_horizonX,
+        y = d3_horizonY,
+        w = 960,
+        h = 40,
+        duration = 0;
+
+    var color = d3.scale.linear()
+        .domain([-1, 0, 1])
+        .range(["#d62728", "#fff", "#1f77b4"]);
+
+    // For each small multiple…
+    function horizon(g) {
+      g.each(function(d, i) {
+        var g = d3.select(this),
+            n = 2 * bands + 1,
+            xMin = Infinity,
+            xMax = -Infinity,
+            yMax = -Infinity,
+            x0, // old x-scale
+            y0, // old y-scale
+            id; // unique id for paths
+
+        // Compute x- and y-values along with extents.
+        var data = d.map(function(d, i) {
+          var xv = x.call(this, d, i),
+              yv = y.call(this, d, i);
+          if (xv < xMin) xMin = xv;
+          if (xv > xMax) xMax = xv;
+          if (-yv > yMax) yMax = -yv;
+          if (yv > yMax) yMax = yv;
+          return [xv, yv];
+        });
+
+        // Compute the new x- and y-scales, and transform.
+        var x1 = d3.scale.linear().domain([xMin, xMax]).range([0, w]),
+            y1 = d3.scale.linear().domain([0, yMax]).range([0, h * bands]),
+            t1 = d3_horizonTransform(bands, h, mode);
+
+        // Retrieve the old scales, if this is an update.
+        if (this.__chart__) {
+          x0 = this.__chart__.x;
+          y0 = this.__chart__.y;
+          t0 = this.__chart__.t;
+          id = this.__chart__.id;
+        } else {
+          x0 = x1.copy();
+          y0 = y1.copy();
+          t0 = t1;
+          id = ++d3_horizonId;
+        }
+
+        // We'll use a defs to store the area path and the clip path.
+        var defs = g.selectAll("defs")
+            .data([null]);
+
+        // The clip path is a simple rect.
+        defs.enter().append("defs").append("clipPath")
+            .attr("id", "d3_horizon_clip" + id)
+          .append("rect")
+            .attr("width", w)
+            .attr("height", h);
+
+        defs.select("rect").transition()
+            .duration(duration)
+            .attr("width", w)
+            .attr("height", h);
+
+        // We'll use a container to clip all horizon layers at once.
+        g.selectAll("g")
+            .data([null])
+          .enter().append("g")
+            .attr("clip-path", "url(#d3_horizon_clip" + id + ")");
+
+        // Instantiate each copy of the path with different transforms.
+        var path = g.select("g").selectAll("path")
+            .data(d3.range(-1, -bands - 1, -1).concat(d3.range(1, bands + 1)), Number);
+
+        var d0 = d3_horizonArea
+            .interpolate(interpolate)
+            .x(function(d) { return x0(d[0]); })
+            .y0(h * bands)
+            .y1(function(d) { return h * bands - y0(d[1]); })
+            (data);
+
+        var d1 = d3_horizonArea
+            .x(function(d) { return x1(d[0]); })
+            .y1(function(d) { return h * bands - y1(d[1]); })
+            (data);
+
+        path.enter().append("path")
+            .style("fill", color)
+            .attr("transform", t0)
+            .attr("d", d0);
+
+        path.transition()
+            .duration(duration)
+            .style("fill", color)
+            .attr("transform", t1)
+            .attr("d", d1);
+
+        path.exit().transition()
+            .duration(duration)
+            .attr("transform", t1)
+            .attr("d", d1)
+            .remove();
+
+        // Stash the new scales.
+        this.__chart__ = {x: x1, y: y1, t: t1, id: id};
+      });
+      d3.timer.flush();
+    }
+
+    horizon.duration = function(x) {
+      if (!arguments.length) return duration;
+      duration = +x;
+      return horizon;
+    };
+
+    horizon.bands = function(x) {
+      if (!arguments.length) return bands;
+      bands = +x;
+      color.domain([-bands, 0, bands]);
+      return horizon;
+    };
+
+    horizon.mode = function(x) {
+      if (!arguments.length) return mode;
+      mode = x + "";
+      return horizon;
+    };
+
+    horizon.colors = function(x) {
+      if (!arguments.length) return color.range();
+      color.range(x);
+      return horizon;
+    };
+
+    horizon.interpolate = function(x) {
+      if (!arguments.length) return interpolate;
+      interpolate = x + "";
+      return horizon;
+    };
+
+    horizon.x = function(z) {
+      if (!arguments.length) return x;
+      x = z;
+      return horizon;
+    };
+
+    horizon.y = function(z) {
+      if (!arguments.length) return y;
+      y = z;
+      return horizon;
+    };
+
+    horizon.width = function(x) {
+      if (!arguments.length) return w;
+      w = +x;
+      return horizon;
+    };
+
+    horizon.height = function(x) {
+      if (!arguments.length) return h;
+      h = +x;
+      return horizon;
+    };
+
+    return horizon;
+  };
+
+  var d3_horizonArea = d3.svg.area(),
+      d3_horizonId = 0;
+
+  function d3_horizonX(d) {
+    return d[0];
+  }
+
+  function d3_horizonY(d) {
+    return d[1];
+  }
+
+  function d3_horizonTransform(bands, h, mode) {
+    return mode == "offset"
+        ? function(d) { return "translate(0," + (d + (d < 0) - bands) * h + ")"; }
+        : function(d) { return (d < 0 ? "scale(1,-1)" : "") + "translate(0," + (d - bands) * h + ")"; };
+  }
+})();
diff --git a/lib/sankey.js b/lib/sankey.js
new file mode 100644
index 0000000..c3bc59f
--- /dev/null
+++ b/lib/sankey.js
@@ -0,0 +1,292 @@
+d3.sankey = function() {
+  var sankey = {},
+      nodeWidth = 24,
+      nodePadding = 8,
+      size = [1, 1],
+      nodes = [],
+      links = [];
+
+  sankey.nodeWidth = function(_) {
+    if (!arguments.length) return nodeWidth;
+    nodeWidth = +_;
+    return sankey;
+  };
+
+  sankey.nodePadding = function(_) {
+    if (!arguments.length) return nodePadding;
+    nodePadding = +_;
+    return sankey;
+  };
+
+  sankey.nodes = function(_) {
+    if (!arguments.length) return nodes;
+    nodes = _;
+    return sankey;
+  };
+
+  sankey.links = function(_) {
+    if (!arguments.length) return links;
+    links = _;
+    return sankey;
+  };
+
+  sankey.size = function(_) {
+    if (!arguments.length) return size;
+    size = _;
+    return sankey;
+  };
+
+  sankey.layout = function(iterations) {
+    computeNodeLinks();
+    computeNodeValues();
+    computeNodeBreadths();
+    computeNodeDepths(iterations);
+    computeLinkDepths();
+    return sankey;
+  };
+
+  sankey.relayout = function() {
+    computeLinkDepths();
+    return sankey;
+  };
+
+  sankey.link = function() {
+    var curvature = .5;
+
+    function link(d) {
+      var x0 = d.source.x + d.source.dx,
+          x1 = d.target.x,
+          xi = d3.interpolateNumber(x0, x1),
+          x2 = xi(curvature),
+          x3 = xi(1 - curvature),
+          y0 = d.source.y + d.sy + d.dy / 2,
+          y1 = d.target.y + d.ty + d.dy / 2;
+      return "M" + x0 + "," + y0
+           + "C" + x2 + "," + y0
+           + " " + x3 + "," + y1
+           + " " + x1 + "," + y1;
+    }
+
+    link.curvature = function(_) {
+      if (!arguments.length) return curvature;
+      curvature = +_;
+      return link;
+    };
+
+    return link;
+  };
+
+  // Populate the sourceLinks and targetLinks for each node.
+  // Also, if the source and target are not objects, assume they are indices.
+  function computeNodeLinks() {
+    nodes.forEach(function(node) {
+      node.sourceLinks = [];
+      node.targetLinks = [];
+    });
+    links.forEach(function(link) {
+      var source = link.source,
+          target = link.target;
+      if (typeof source === "number") source = link.source = nodes[link.source];
+      if (typeof target === "number") target = link.target = nodes[link.target];
+      source.sourceLinks.push(link);
+      target.targetLinks.push(link);
+    });
+  }
+
+  // Compute the value (size) of each node by summing the associated links.
+  function computeNodeValues() {
+    nodes.forEach(function(node) {
+      node.value = Math.max(
+        d3.sum(node.sourceLinks, value),
+        d3.sum(node.targetLinks, value)
+      );
+    });
+  }
+
+  // Iteratively assign the breadth (x-position) for each node.
+  // Nodes are assigned the maximum breadth of incoming neighbors plus one;
+  // nodes with no incoming links are assigned breadth zero, while
+  // nodes with no outgoing links are assigned the maximum breadth.
+  function computeNodeBreadths() {
+    var remainingNodes = nodes,
+        nextNodes,
+        x = 0;
+
+    while (remainingNodes.length) {
+      nextNodes = [];
+      remainingNodes.forEach(function(node) {
+        node.x = x;
+        node.dx = nodeWidth;
+        node.sourceLinks.forEach(function(link) {
+          nextNodes.push(link.target);
+        });
+      });
+      remainingNodes = nextNodes;
+      ++x;
+    }
+
+    //
+    moveSinksRight(x);
+    scaleNodeBreadths((size[0] - nodeWidth) / (x - 1));
+  }
+
+  function moveSourcesRight() {
+    nodes.forEach(function(node) {
+      if (!node.targetLinks.length) {
+        node.x = d3.min(node.sourceLinks, function(d) { return d.target.x; }) - 1;
+      }
+    });
+  }
+
+  function moveSinksRight(x) {
+    nodes.forEach(function(node) {
+      if (!node.sourceLinks.length) {
+        node.x = x - 1;
+      }
+    });
+  }
+
+  function scaleNodeBreadths(kx) {
+    nodes.forEach(function(node) {
+      node.x *= kx;
+    });
+  }
+
+  function computeNodeDepths(iterations) {
+    var nodesByBreadth = d3.nest()
+        .key(function(d) { return d.x; })
+        .sortKeys(d3.ascending)
+        .entries(nodes)
+        .map(function(d) { return d.values; });
+
+    //
+    initializeNodeDepth();
+    resolveCollisions();
+    for (var alpha = 1; iterations > 0; --iterations) {
+      relaxRightToLeft(alpha *= .99);
+      resolveCollisions();
+      relaxLeftToRight(alpha);
+      resolveCollisions();
+    }
+
+    function initializeNodeDepth() {
+      var ky = d3.min(nodesByBreadth, function(nodes) {
+        return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
+      });
+
+      nodesByBreadth.forEach(function(nodes) {
+        nodes.forEach(function(node, i) {
+          node.y = i;
+          node.dy = node.value * ky;
+        });
+      });
+
+      links.forEach(function(link) {
+        link.dy = link.value * ky;
+      });
+    }
+
+    function relaxLeftToRight(alpha) {
+      nodesByBreadth.forEach(function(nodes, breadth) {
+        nodes.forEach(function(node) {
+          if (node.targetLinks.length) {
+            var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
+            node.y += (y - center(node)) * alpha;
+          }
+        });
+      });
+
+      function weightedSource(link) {
+        return center(link.source) * link.value;
+      }
+    }
+
+    function relaxRightToLeft(alpha) {
+      nodesByBreadth.slice().reverse().forEach(function(nodes) {
+        nodes.forEach(function(node) {
+          if (node.sourceLinks.length) {
+            var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
+            node.y += (y - center(node)) * alpha;
+          }
+        });
+      });
+
+      function weightedTarget(link) {
+        return center(link.target) * link.value;
+      }
+    }
+
+    function resolveCollisions() {
+      nodesByBreadth.forEach(function(nodes) {
+        var node,
+            dy,
+            y0 = 0,
+            n = nodes.length,
+            i;
+
+        // Push any overlapping nodes down.
+        nodes.sort(ascendingDepth);
+        for (i = 0; i < n; ++i) {
+          node = nodes[i];
+          dy = y0 - node.y;
+          if (dy > 0) node.y += dy;
+          y0 = node.y + node.dy + nodePadding;
+        }
+
+        // If the bottommost node goes outside the bounds, push it back up.
+        dy = y0 - nodePadding - size[1];
+        if (dy > 0) {
+          y0 = node.y -= dy;
+
+          // Push any overlapping nodes back up.
+          for (i = n - 2; i >= 0; --i) {
+            node = nodes[i];
+            dy = node.y + node.dy + nodePadding - y0;
+            if (dy > 0) node.y -= dy;
+            y0 = node.y;
+          }
+        }
+      });
+    }
+
+    function ascendingDepth(a, b) {
+      return a.y - b.y;
+    }
+  }
+
+  function computeLinkDepths() {
+    nodes.forEach(function(node) {
+      node.sourceLinks.sort(ascendingTargetDepth);
+      node.targetLinks.sort(ascendingSourceDepth);
+    });
+    nodes.forEach(function(node) {
+      var sy = 0, ty = 0;
+      node.sourceLinks.forEach(function(link) {
+        link.sy = sy;
+        sy += link.dy;
+      });
+      node.targetLinks.forEach(function(link) {
+        link.ty = ty;
+        ty += link.dy;
+      });
+    });
+
+    function ascendingSourceDepth(a, b) {
+      return a.source.y - b.source.y;
+    }
+
+    function ascendingTargetDepth(a, b) {
+      return a.target.y - b.target.y;
+    }
+  }
+
+  function center(node) {
+    return node.y + node.dy / 2;
+  }
+
+  function value(link) {
+    return link.value;
+  }
+
+  return sankey;
+};