color green = color(0, 255, 0);
color red = color(255, 0, 0);
color black = color(0);
color cream = color(242, 212, 147);

void setup() {
  size(400, 400);
  background(255);
  stroke(255);
  strokeWeight(3);

  float cx = width / 2;
  float cy = height / 2;
  float maxR = min(width, height);

  fill(black);
  ellipse(cx, cy, maxR, maxR);

  for (int i = 0; i < 20; i++) {
    float start = TWO_PI / 20 * i;
    float stop = TWO_PI / 20 * (i + 1);
    fill(i % 2 == 0 ? green : red);
    arc(cx, cy, maxR * 0.8, maxR * 0.8, start, stop, PIE);
  }

  for (int i = 0; i < 20; i++) {
    float start = TWO_PI / 20 * i;
    float stop = TWO_PI / 20 * (i + 1);
    fill(i % 2 == 0 ? cream : black);
    arc(cx, cy, maxR * 0.75, maxR * 0.75, start, stop, PIE);
  }

  for (int i = 0; i < 20; i++) {
    float start = TWO_PI / 20 * i;
    float stop = TWO_PI / 20 * (i + 1);
    fill(i % 2 == 0 ? green : red);
    arc(cx, cy, maxR * 0.5, maxR * 0.5, start, stop, PIE);
  }

  for (int i = 0; i < 20; i++) {
    float start = TWO_PI / 20 * i;
    float stop = TWO_PI / 20 * (i + 1);
    fill(i % 2 == 0 ? cream : black);
    arc(cx, cy, maxR * 0.45, maxR * 0.45, start, stop, PIE);
  }

  fill(green);
  ellipse(cx, cy, maxR * 0.1, maxR * 0.1);
  fill(red);
  ellipse(cx, cy, maxR * 0.05, maxR * 0.05);
}