// fork from System:シンプル
!gear = \()
 fs("black")
  scale(0.6)
   circle()
  rotate(t/100)
   flower(10)
    shift(0,0.3)
     scale(0.1)
      rect()
 fs("white")
  scale(0.4)
   circle()

scale(0.6)
 grid(3,3)
  gear()