clear()
setFillColor(white)
circle(100)
setSpeed(fast)
circle(80)
circle(60)
circle(160)
circle(40)
circle(120)
circle(140)
circle(20)
setBackgroundH(purple, black)
circle(10)
circle(30)
circle(50)
circle(70)
circle(90)
circle(110)
circle(130)
circle(150)
hop(20)