let span = 5; 

let circles = [];

let filly = true;

let acc = 0.001;

​

function setup() {

  createCanvas(500, 500);

  for(let i = 0; i < 10; i++){

    let victor = createVector(200, 200, 1);

    victor.filly = filly ? 255 : 0; 

    victor.acc = acc;

    victor.span = span;

    circles.push(victor);

    filly = !filly;

    acc += 0.001;

    span += 2;

  }

  noStroke();

}

​

function draw() {

   background(0);

  for(let i = circles.length; i > 0; i--){

    f = circles[i-1].filly;

    fill(f);

    circles[i-1].x = width/2 + sin(pos+i) * circles[i-1].span;

    ellipse(circles[i-1].x, height/2, i*35, i*35);

    pos += circles[i-1].acc;

  }

}

​