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HTML 

              
                <canvas id="canvas" width="500" height="500">drawing…hopefully…</canvas>
!

CSS 

              
                html,
body {
  overflow: hidden;
  padding: 0;
  margin: 0;
  width: 100vw;
  height: 100vh;
  width: 100dvw;
  height: 100dvh;
  width: 100mvw;
  height: 100mvh;
}

canvas {
  width: 100vw;
  height: 99vh;
}
!

JS 

              
                // Set up a grid
// Draw shapes at each gridpoint
// - orient in a pattern
// - give each a reflective direction (think 'normal map' in 3D)
// - change color depending on difference in angle from pointer to shape's reflective direction.

// Universal constants
const TAU = Math.PI * 2;

// Artwork variables
const hueRange = 10;
const hueShift = 210;

// Prepare canvas
const canvas = document.getElementById("canvas");
const pxWidth = window.innerWidth * window.devicePixelRatio;
const pxHeight = window.innerHeight * window.devicePixelRatio;
canvas.width = pxWidth;
canvas.height = pxHeight;
const ctx = canvas.getContext("2d");
ctx.globalCompositeOperation = "source-over";

const smallestSide =
  canvas.width > canvas.height ? canvas.height : canvas.width;
const gridSize = Math.round(smallestSide * 0.16);

// Initialise pointer position to the center of the canvas
let mouseX = -pxWidth;
let mouseY = -pxHeight;

function getIsometricCoords([px, py]) {
  const origin = [canvas.width * 0.5, canvas.height * 0.5];
  const [ox, oy] = origin;
  const gridSeparation = gridSize; //Math.round(canvas.height * 0.01)
  const dy = Math.sin((TAU * 60) / 360) * gridSeparation;
  let x;
  let y;

  x = gridSeparation * px;
  if (!!(py % 2)) {
    x = x + gridSeparation * 0.5;
  }
  y = dy * py;

  const useAlternativeOrientation = true;
  if (useAlternativeOrientation) {
    // Rotate angles by 30°
    const rotate = TAU / 12;
    [x, y] = [
      x * Math.cos(rotate) - y * Math.sin(rotate),
      x * Math.sin(rotate) + y * Math.cos(rotate)
    ];
  }

  // Translate to our chosen grid origin
  x = x + ox;
  y = y + oy;

  return [x, y];
}

const gridCoordinates = [
  [-1, -2],
  [0, -2],
  [1, -2],
  [-2, -1],
  [-1, -1],
  [0, -1],
  [1, -1],
  [-2, 0],
  [-1, 0],
  [1, 0],
  [2, 0],
  [-2, 1],
  [-1, 1],
  [0, 1],
  [1, 1],
  [-1, 2],
  [0, 2],
  [1, 2]
]
  .map(getIsometricCoords)
  .map(([x, y]) => {
    return { x, y };
  });

// Fill canvas
function clearCanvas() {
  ctx.globalCompositeOperation = "source-over";
  ctx.fillStyle = "#000";
  ctx.fillRect(0, 0, canvas.width, canvas.height);
}

// Prepare shape data
const hexagonsData = gridCoordinates.map((position, index) => {
  const size = gridSize * 0.575;
  const shape = {
    x: position.x,
    y: position.y,
    size,
    spin: 0,
    tHueShift: 0,
    normal: TAU * 0.6,
    rotation: 0, //TAU / 6,
    random: Math.random() - 0.5,
    disalignmentRate: Math.random() - 0.5
  };
  shape.normal =
    TAU * 0.5 +
    Math.atan2(
      position.y - canvas.height * 0.5,
      position.x - canvas.width * 0.5
    );
  shape.targetNormal = shape.normal;
  return shape;
});

function cross(a, b) {
  return a.x * b.y - a.y * b.x;
}

let loopPhase = "";
let nextLoop = true;
function drawArtwork(t = 0) {
  clearCanvas();
  ctx.globalCompositeOperation = "source-over"; //"multiply";
  if (nextLoop && loopPhase === "disalignment") {
    nextLoop = false;
    // Randomise hexagon behaviour for next loop
    hexagonsData.forEach((shape, i) => {
      shape.disalignmentRate = Math.random() * 0.7 + 0.3;
      shape.disalignmentRate =
        Math.random() > 0.5 ? shape.disalignmentRate : -shape.disalignmentRate;
    });
  }
  if (t % 12000 < 6000) {
    loopPhase = "disalignment";
    // Disalign mirrors
    hexagonsData.forEach((shape, i) => {
      shape.normal += shape.disalignmentRate * 0.1;
    });
  } else {
    loopPhase = "alignment";
    nextLoop = true;
    // Align mirrors
    hexagonsData.forEach((shape, i) => {
      // Compute cursor angle from shape normal
      const dx = mouseX - shape.x;
      const dy = mouseY - shape.y;
      const dAngle = Math.atan2(dy, dx);
      const pointerAlignmentAngle = Math.atan2(
        Math.sin(dAngle - shape.normal),
        Math.cos(dAngle - shape.normal)
      );
      let targetPointerAngle = dAngle;
      let cp = cross(
        { x: dx, y: dy },
        { x: Math.cos(shape.normal), y: Math.sin(shape.normal) }
      );
      shape.normal += -cp * 0.00002;
    });
  }
  hexagonsData.forEach(drawHexagon);
  window.requestAnimationFrame(drawArtwork);
}

// Start the art
drawArtwork();

function drawHexagon(shape, tIndex) {
  const { x, y, normal, targetNormal, size, spin, tHueShift, rotation } = shape;
  // Increment shape orientation
  // Compute cursor angle from shape normal
  const dx = mouseX - x;
  const dy = mouseY - y;
  const dAngle = Math.atan2(dy, dx);
  const pointerAlignmentAngle = Math.abs(
    Math.atan2(Math.sin(dAngle - normal), Math.cos(dAngle - normal))
  );
  // shape.normal = dAngle;
  // Compute distance falloff factor
  const distance = Math.sqrt(dx ** 2 + dy ** 2);
  const lightPower = canvas.width * 1;
  const minDistanceFactor = 0.2;
  let distanceFactor = (lightPower - distance) / lightPower;
  // distanceFactor = distanceFactor < minDistanceFactor ? minDistanceFactor : distanceFactor;
  // Compute reflectance strength
  const pointerAlignmentDecimal = (Math.PI - pointerAlignmentAngle) / Math.PI;
  // const reflectanceStrength = (pointerAlignmentDecimal*0.2 + 0.8) * distanceFactor;
  const reflectanceStrength = pointerAlignmentDecimal ** 3 * 0.8 + 0.01;
  // Triangle path shape setup
  ctx.beginPath();
  const polygonSides = 6;
  const polyAngle = 1 / polygonSides;
  for (let i = 0; i < polygonSides; i++) {
    ctx.lineTo(
      x + size * Math.cos(rotation + TAU * i * polyAngle),
      y + size * Math.sin(rotation + TAU * i * polyAngle)
    );
  }
  ctx.closePath();
  // Fill shape
  // const hue = (pointerAlignmentAngle / Math.PI) * hueRange + hueShift + tHueShift;
  // const hue = (hueRange * (Math.abs(TAU*0.75 - shape.normal))/TAU) + hueShift;
  const hue = 50;
  const sauration = 100;
  const lightness = 100 * reflectanceStrength;
  const alpha = 1; //reflectanceStrength;
  ctx.fillStyle = `hsla(${hue},${sauration}%,${lightness}%,${alpha})`;
  ctx.fill();

  // Draw diagnostics
  const drawDiagnostics = false;
  if (drawDiagnostics) {
    ctx.beginPath();
    ctx.moveTo(x, y);
    ctx.lineTo(
      x + size * 0.5 * Math.cos(normal),
      y + size * 0.5 * Math.sin(normal)
    );
    ctx.closePath();
    ctx.strokeStyle = "red";
    ctx.stroke();
    ctx.beginPath();
    ctx.arc(x, y, 2, 0, TAU);
    ctx.closePath();
    ctx.strokeStyle = "blue";
    ctx.stroke();
  }
}

// Pointer animation before interaction
let pointerLoopRAF;
function pointerLoop(t) {
  const radiusRatio = 1;
  const radius = canvas.width * radiusRatio;
  const rate = 0.0005;
  const x =
    canvas.width * radiusRatio * Math.cos(t * rate) + canvas.width * 0.5;
  const y =
    canvas.height * radiusRatio * Math.sin(t * rate) + canvas.height * 0.5;
  mouseX = x;
  mouseY = y;
  pointerLoopRAF = window.requestAnimationFrame(pointerLoop);
}
// pointerLoop();

// Interactions and Helper functions
canvas.addEventListener("touchmove", handleInteraction, false);
canvas.onmousemove = handleInteraction;

function handleInteraction(e) {
  // Stop the automated cursor animation
  window.cancelAnimationFrame(pointerLoopRAF);
  // Update global cursor coordinate variables
  const { x, y } = getMousePos(this, e);
  mouseX = x;
  mouseY = y;
}

function getMousePos(canvas, e) {
  let x;
  let y;
  if (
    e.type == "touchstart" ||
    e.type == "touchmove" ||
    e.type == "touchend" ||
    e.type == "touchcancel"
  ) {
    x = e.pageX;
    y = e.pageY;
  } else if (
    e.type == "mousedown" ||
    e.type == "mouseup" ||
    e.type == "mousemove" ||
    e.type == "mouseover" ||
    e.type == "mouseout" ||
    e.type == "mouseenter" ||
    e.type == "mouseleave"
  ) {
    const rect = canvas.getBoundingClientRect();
    // subtract the element's left and top position
    x = e.clientX - rect.left;
    y = e.clientY - rect.top;
  }
  return { x, y };
}

// Unused but useful and reference
function drawCoordinatePoints(points) {
  points.forEach(({ x, y }) => {
    ctx.beginPath();
    ctx.arc(x, y, 2, 0, TAU);
    ctx.strokeStyle = "black";
    ctx.stroke();
    ctx.closePath();
  });
}

const canvasGlobalCompositeOperationOptions = [
  "source-over",
  "source-atop",
  // "source-in",
  // "source-out",
  // "destination-over",
  // "destination-atop",
  // "destination-in",
  // "destination-out",
  // "lighter",
  // "copy",
  "xor",
  "multiply",
  "darken"
  // "lighten",
  // "screen", // 🤷‍
  // "color-dodge",
  // "color-burn", // 🤷‍
  // "hard-light",
  // "soft-light", // 🤷‍
  // "difference", // 🤮
  // "exclusion", // 🤮
  // "hue", // 🤷‍
  // "saturation", // 🤷‍
  // "color", // 🤷‍
  // "luminosity", // 🤮
  // "overlay", // 🤷‍
];
!
999px

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