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diff --git a/static/src/_posts/2021-05-28-viz-5.md b/static/src/_posts/2021-05-28-viz-5.md
deleted file mode 100644
index ea2f9e9..0000000
--- a/static/src/_posts/2021-05-28-viz-5.md
+++ /dev/null
@@ -1,306 +0,0 @@
----
-title: >-
-    Visualization 5
-description: >-
-    Seeing double.
-series: viz
-tags: tech art
----
-
-<script type="text/javascript">
-
-function randn(n) {
-    return Math.floor(Math.random() * n);
-}
-
-const w = 100;
-const h = 50;
-
-const maxNewElsPerTick = 10;
-const deathThresh = 10;
-
-class Canvas {
-  constructor(canvasDOM) {
-    this.dom = canvasDOM;
-    this.ctx = canvasDOM.getContext("2d");
-
-    // expand canvas element's width to match parent.
-    this.dom.width = this.dom.parentElement.offsetWidth;
-
-    // rectSize must be an even number or the pixels don't display nicely.
-    this.rectSize = Math.floor(this.dom.width / w /2) * 2;
-
-    this.dom.width = w * this.rectSize;
-    this.dom.height = h * this.rectSize;
-  }
-
-  rectSize() {
-    return Math.floor(this.dom.width / w);
-  }
-}
-
-class Layer {
-  constructor(newEl) {
-    this.els = {};
-    this.diff = {};
-    this.newEl = newEl;
-  }
-
-  _normCoord(coord) {
-    if (typeof coord !== 'string') coord = JSON.stringify(coord);
-    return coord;
-  }
-
-  get(coord) {
-    return this.els[this._normCoord(coord)];
-  }
-
-  getAll() {
-    return Object.values(this.els);
-  }
-
-  set(coord, el) {
-    this.diff[this._normCoord(coord)] = {action: "set", coord: coord, ...el};
-  }
-
-  unset(coord) {
-    this.diff[this._normCoord(coord)] = {action: "unset"};
-  }
-
-  applyDiff() {
-    for (const coordStr in this.diff) {
-      const el = this.diff[coordStr];
-      delete this.diff[coordStr];
-
-      if (el.action == "set") {
-        delete el.action;
-        this.els[coordStr] = el;
-      } else {
-        delete this.els[coordStr];
-      }
-    }
-  }
-
-  update(state) {
-    // Apply diff from previous update first. The diff can't be applied last
-    // because it needs to be present during the draw phase.
-    this.applyDiff();
-
-    const allEls = this.getAll().sort(() => Math.random() - 0.5);
-
-    if (allEls.length == 0) {
-      this.set([w/2, h/2], this.newEl([]));
-    }
-
-    let newEls = 0;
-    for (const el of allEls) {
-      const nCoord = randEmptyNeighboringCoord(this, el.coord);
-      if (!nCoord) continue; // el has no empty neighboring spots
-
-      const nEl = this.newEl(neighboringElsOf(this, nCoord))
-      nEl.tick = state.tick;
-      this.set(nCoord, nEl);
-
-      newEls++;
-      if (newEls >= maxNewElsPerTick) break;
-    }
-
-    for (const el of allEls) {
-      const nEls = neighboringElsOf(this, el.coord);
-      if (state.tick - el.tick - (nEls.length * deathThresh) >= deathThresh) this.unset(el.coord);
-    }
-}
-
-  draw(canvas) {
-    for (const coordStr in this.diff) {
-      const el = this.diff[coordStr];
-      const coord = JSON.parse(coordStr);
-
-      if (el.action == "set") {
-        canvas.ctx.fillStyle = `hsl(${el.h}, ${el.s}, ${el.l})`;
-        canvas.ctx.fillRect(
-          coord[0]*canvas.rectSize, coord[1]*canvas.rectSize,
-          canvas.rectSize, canvas.rectSize,
-        );
-
-      } else {
-        canvas.ctx.clearRect(
-          coord[0]*canvas.rectSize, coord[1]*canvas.rectSize,
-          canvas.rectSize, canvas.rectSize,
-        );
-      }
-    }
-  }
-}
-
-const neighbors = [
-    [-1, -1],   [0, -1],   [1, -1],
-    [-1, 0], /* [0, 0], */ [1, 0],
-    [-1, 1],    [0, 1],    [1, 1],
-];
-
-function neighborsOf(coord) {
-  return neighbors.map((n) => {
-    let nX = coord[0]+n[0];
-    let nY = coord[1]+n[1];
-    nX = (nX + w) % w;
-    nY = (nY + h) % h;
-    return [nX, nY];
-  });
-}
-
-function randEmptyNeighboringCoord(layer, coord) {
-  const neighbors = neighborsOf(coord).sort(() => Math.random() - 0.5);
-  for (const nCoord of neighbors) {
-    if (!layer.get(nCoord)) return nCoord;
-  }
-  return null;
-}
-
-function neighboringElsOf(layer, coord) {
-  const neighboringEls = [];
-  for (const nCoord of neighborsOf(coord)) {
-    const el = layer.get(nCoord);
-    if (el) neighboringEls.push(el);
-  }
-  return neighboringEls;
-}
-
-const drift = 30;
-function mkNewEl(l) {
-  return (nEls) => {
-    const s = "100%";
-    if (nEls.length == 0) {
-      return {
-        h: randn(360),
-        s: s,
-        l: l,
-      };
-    }
-
-    // for each h (which can be considered as degrees around a circle) break the h
-    // down into x and y vectors, and add those up separately. Then find the angle
-    // between those two resulting vectors, and that's the "average" h value.
-    let x = 0;
-    let y = 0;
-    nEls.forEach((el) => {
-      const hRad = el.h * Math.PI / 180;
-      x += Math.cos(hRad);
-      y += Math.sin(hRad);
-    });
-
-    let h = Math.atan2(y, x);
-    h = h / Math.PI * 180;
-
-    // apply some random drift, normalize
-    h += (Math.random() * drift * 2) - drift;
-    h = (h + 360) % 360;
-
-    return {
-      h: h,
-      s: s,
-      l: l,
-    };
-  }
-}
-
-class Universe {
-  constructor(canvasesByClass, layersByClass) {
-    this.canvasesByClass = canvasesByClass;
-    this.state = {
-      tick: 0,
-      layers: layersByClass,
-    };
-  }
-
-  update() {
-    this.state.tick++;
-    Object.values(this.state.layers).forEach((layer) => layer.update(this.state));
-  }
-
-  draw() {
-    for (const layerName in this.state.layers) {
-      if (!this.canvasesByClass[layerName]) return;
-      this.canvasesByClass[layerName].forEach((canvas) => {
-        this.state.layers[layerName].draw(canvas);
-      });
-    }
-  }
-}
-
-</script>
-
-<style>
-
-.canvasContainer {
-  display: grid;
-  margin-bottom: 2rem;
-  text-align: center;
-}
-
-canvas {
-  border: 1px dashed #AAA;
-  width: 100%;
-  grid-area: 1/1/2/2;
-}
-
-</style>
-
-<div class="canvasContainer">
-  <canvas class="layer1"></canvas>
-  <canvas class="layer2"></canvas>
-</div>
-
-<div class="row">
-  <div class="columns six">
-    <div class="canvasContainer"><canvas class="layer1"></canvas></div>
-  </div>
-  <div class="columns six">
-    <div class="canvasContainer"><canvas class="layer2"></canvas></div>
-  </div>
-</div>
-
-This visualization combines two distinct layers, each of them borrowing their
-behavior from [Visualization 4][viz4]. Neither layer has any effect on the
-other, one is merely super-imposed on top of the other in the top canvas. You
-can see each layer individually in the two lower canvases.
-
-Despite their not affecting each other, the code is set up so that each layer
-_could_ be affected by the other. This will likely be explored more in a future
-post.
-
-[viz4]: {% post_url 2021-05-26-viz-4 %}
-
-<script>
-
-const canvasesByClass = {};
-[...document.getElementsByTagName("canvas")].forEach((canvasDOM) => {
-
-  const canvas = new Canvas(canvasDOM);
-  canvasDOM.classList.forEach((name) => {
-    if (!canvasesByClass[name]) canvasesByClass[name] = [];
-    canvasesByClass[name].push(canvas);
-  })
-});
-
-
-const universe = new Universe(canvasesByClass, {
-  "layer1": new Layer(mkNewEl("90%")),
-  "layer2": new Layer(mkNewEl("50%")),
-});
-
-const requestAnimationFrame =
-  window.requestAnimationFrame ||
-  window.mozRequestAnimationFrame ||
-  window.webkitRequestAnimationFrame ||
-  window.msRequestAnimationFrame;
-
-function doTick() {
-  universe.update();
-  universe.draw();
-  requestAnimationFrame(doTick);
-}
-
-doTick();
-
-</script>