Rotating Snakes Illusion

var snakes = [];

var beginSpace = 250;

var jumpSpace = 226;

​

function setup() {

  createCanvas(1200, 750);

  background(255);

  for (let i = 0; i < 4; i++) {

    snakes.push(new SnakeCircle(beginSpace + jumpSpace * i, 0.8 * height/5, false, i));

    snakes[snakes.length - 1].completeSnake();

  }

  for (let i = 7; i < 11; i++) {

    snakes.push(new SnakeCircle(beginSpace + jumpSpace * (i-7), 2.4 * height/5, false, i));

    snakes[snakes.length - 1].completeSnake();

  }

  for (let i = 14; i < 18; i++) {

    snakes.push(new SnakeCircle(beginSpace + jumpSpace * (i-14), 4.0 * height/5, false, i));

    snakes[snakes.length - 1].completeSnake();

  }

  for (let i = 4; i < 7; i++) {

    snakes.push(new SnakeCircle(beginSpace+125 + jumpSpace * (i-4), 1.6 * height/5, false, i));

    snakes[snakes.length - 1].completeSnake();

  }

  for (let i = 11; i < 14; i++) {

    snakes.push(new SnakeCircle(beginSpace+125 + jumpSpace * (i-11), 3.2 * height/5, false, i));

    snakes[snakes.length - 1].completeSnake();

  }

}

​

function tongue(x, y, w, h) {

  stroke(255, 0, 0);

  noFill();

  strokeWeight(2);

  line(x, y, x, y-h);

  line(x,y-h,x-w/2,y-h-w/2);

  line(x,y-h,x+w/2,y-h-w/2);

  strokeWeight(1);

}