let spacing = 5; 

let size = [];

let scl = 0.01;

let x = 0; let y = 0; let dx = 2; let dy = 3;

let xoff = 0;

​

function setup() {

  createCanvas(1000, 500);

  cols = width/spacing;

  rows = height/spacing; 

  rectMode(CENTER);

}

​

function draw() {

  background(244, 244, 243);

  x = x + dx;

  y = y + dy;

  if (x > width || x < 0){

    dx = dx * -1;

  }

  if (y > height || y < 0){

    dy = dy * -1;

  }

  for (let i=0; i<cols; i++){

    size[i] = [];

    for (let j=0; j<rows; j++){

      size[i][j] = (dist(x, y, i*spacing, j*spacing))*scl;

    }

  }

  let r = noise(xoff)*255;

  let g = noise(xoff+15)*255;

  let b = noise(xoff+30)*255;

  for (let i=0; i<cols; i++){

    for (let j=0; j<rows; j++){

      noStroke();

      fill(r, g, b);

      rect(spacing/2 + i*spacing, spacing/2 + j*spacing, size[i][j], size[i][j]);

    }

  }

  xoff += 0.005;

}