let cellSize = 20;

let pattern = [];

​

function setup() {

  createCanvas(gridSize * cellSize, gridSize * cellSize);

  background(255);

  noStroke();

​

  // initialize the pattern with random values

  for (let i = 0; i < gridSize; i++) {

    pattern[i] = [];

    for (let j = 0; j < gridSize; j++) {

      pattern[i][j] = random(2);

    }

  }

​

  // draw the pattern

  for (let i = 0; i < gridSize; i++) {

    for (let j = 0; j < gridSize; j++) {

      if (pattern[i][j] == 1) {

        fill(0);

      } else {

        fill(255);

      }

      rect(i * cellSize, j * cellSize, cellSize, cellSize);

    }

  }

}

​

function draw() {

  // apply the wave function collapse algorithm here

}

​