void setup(){
size (300, 600);
background (255,252,183);
smooth();
}
void draw(){
strokeWeight(4);


stroke(68,198,18, 200);
noFill();
for (int i=20; i< 3000; i+=40){
  arc(500, 1000, i+15, i+15, 0, PI+HALF_PI);
}


strokeWeight(4);
stroke(205,8,250, 230);
noFill();
for (int i=20; i< 3000; i+=40) {
  arc (500, 0, i + 15, i + 15, 0, PI);
}


strokeWeight(3);
stroke(205,8,250, 100);
noFill();
for (int i=20; i< 3000; i+=40) {
  arc (500, 0, i + 2, i + 2, 0, PI);
}

 

strokeWeight(3);
stroke(68,198,18,100);
noFill();
for (int i=20; i< 3000; i+=40){
  arc(500, 1000, i+2, i+2, 0, PI+HALF_PI);
stop();
} 
}