s1= rectangle(fill="yellow",stroke="none") s2= s1|rotate(45) s3= s1|rotate(90) s4= s1|rotate(135) c1= circle(r=50,fill="white",stroke="green") c2= circle(r=40,fill="yellow",stroke="green") c3= circle(r=30,fill="red",stroke="green") c4= circle(r=20,fill="purple",stroke="green") show(s1,s2,s3,s4,c1,c2,c3,c4)