size(400, 400);

//draw the large black circle
fill(0);
ellipse(200, 200, 400, 400);

//draw the large white half-circle
fill(255);
arc(200, 200, 400, 400, radians(270), radians(450));

//draw the middle black circle
fill(0);
ellipse(200, 100, 200, 200);

//draw the middle white circle
noStroke();
fill(255);
ellipse(200, 300, 200, 200);

//draw the two small circles
ellipse(200, 100, 50, 50);
fill(0);
ellipse(200, 300, 50, 50);

text("Yin Yang", 10, 10);