Glitch butterfly

function setup() {
  createCanvas(600, 600);
}

let mod = (x,y) => (x%y + y)%y

function draw() {
  blendMode(BLEND)
  background(255);
  blendMode(MULTIPLY)
  noStroke()
  translate(width/2, height/2)
  let ss = 0.2 + abs(frameCount / 141 % 2 - 1) * 0.8
  let s = ss + abs(frameCount / 30 % 2 - 1) * (1 - ss)
  for (let i = -10; i <= 10; i ++) {
    for (let j = -10; j <= 10; j ++) {
      fill(255, 255, 0)
      rect(i * (abs(i)*1.4 + (-j%4.3)) * s + min(i*2,0), j * (abs(j)*1.4 + mod(-i,4)) + min(j*2,0) - abs(i)*s, abs(i*2) * s, abs(j*2))
    }
  }
  translate(3, 3)
  for (let i = -10; i <= 10; i ++) {
    for (let j = -10; j <= 10; j ++) {
      fill(0, 255, 255)
      rect(i * (abs(i)*1.4 + (-j%4)) * s + min(i*2,0), j * (abs(j)*1.4 + mod(-i,3)) + min(j*2,0) - abs(i)*s, abs(i*2) * s, abs(j*2))
    }
  }
  for (let i = -10; i <= 10; i ++) {
    for (let j = -10; j <= 10; j ++) {
      fill(255, 0, 255)
      rect(i * (abs(i)*1.4 + (-j%4.5)) * s + min(i*2,0), j * (abs(j)*1.4 + mod(i,5)) + min(j*2,0) - abs(i)*s, abs(i*2) * s, abs(j*2))
    }
  }
  
}