const ripples = 12.4

const lines = 10

​

function setup() {

  createCanvas(400, 400);

  noLoop()

  noFill()

  strokeWeight(3)

  stroke("#38373C")

  background("#EEEEEE");

}

​

function draw() {

  // Circles

  for (let i = 0; i < height * 2.5; i += height * 2.5 / ripples) {

    circle(0, 0, i)

    circle(width, height, i)

  }

​

  // // Grid

  for (let i = 0; i < height + (height/ lines); i += height / lines) {

    line(0, i, width, i)

    line(i, 0, i, height)

  }

}