Echo 2D wave 2

let w = 50;

let h = 50;

​

function setup() {

  createCanvas(874, 620);

  background(255);

  ellipseMode(CENTER);

  noFill()

}

​

function draw() {

  background(255)

  translate(50, 50);

  for (let k=0; k<8; k++) {

    strokeWeight(k+1)

    for (let i=0; i<11; i++) {

      let a=map(sin(millis()/1000+k/3),-1,1,0,30)

      let b=map(sin(millis()/1000+i/3),-1,1,0,70)

      push();

      translate(i*75, k*150);

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

        ellipse(0,0,b+a*j,b+a*j)

      }

      pop();

    }

  }

}