SOURCE

function setup() {
    createCanvas(500, 500)
    background(255)
}
function draw() {
    fill(60, 60, 80)
    push()
    scale(map(mouseX, 0, 500, 0, 1))
    ellipse(60, 260, 80, 80)
    pop()
    push()
    stroke(0)
    scale(map(mouseX, 0, 500, 0, 1.5))
    ellipse(360, 160, 30, 30)
    pop()
    push()
    stroke(0)
    scale(map(mouseX, 0, 500, 0, 2))
    ellipse(400, 350, 180, 180)
    pop()
}