In [1]:
ellipse(50, 50, 80, 80);
Sketch #1:

Sketch #1 state: Loading...
In [2]:
void setup() {
  size(480, 120);
}

void draw() {
  if (mousePressed) {
    fill(0);
  } else {
    fill(255);
  }
  ellipse(mouseX, mouseY, 80, 80);
}
Sketch #2:

Sketch #2 state: Loading...