void setup() {
  size(300,300);
  background(0);
  fill(255,50);
  stroke(255,80);
  strokeWeight(0);
  smooth();
}

int a = 5;
void draw() {
  a = a + 5;
  pinheads(a, a*2.5);
  }

void pinheads(int x, float y) {
  ellipse(x, y, x%y, x%y);
  ellipse(y, x, x%y, x%y);
  ellipse(300-x, 300-y, x%y, x%y);
  ellipse(300-y, 300-x, x%y, x%y);

}