Circle Recursion. First, copy and paste the following code to processing IDE (PDE).

void setup() {

size(800, 800);

noStroke();

noLoop();

}

void draw() {

drawCircle(width/2, 280, 6);

}

void drawCircle(int x, int radius, int level) {

float tt = 126 * level/4.0;

fill(tt);

/**

https://processing.org/reference/ellipse_.html

a float: x-coordinate of the ellipse

b float: y-coordinate of the ellipse

c float: width of the ellipse by default

d float: height of the ellipse by default

**/

ellipse(x, height/2, radius*2, radius*2);

if(level > 1) {

level = level - 1;

drawCircle(x - radius/2, radius/2, level);

drawCircle(x + radius/2, radius/2, level);

}

}