Galton board sim

3

You can use Pen.addRect to draw rectangles.
From the help file:

(
w = Window.new.front;
w.view.background_(Color.white);
w.drawFunc = {
    80.do{
        // set the Color
        Pen.color = Color.green(rrand(0.0, 1), rrand(0.0, 0.5));
        Pen.addRect(
            Rect(20, 20, (w.bounds.width-40).rand, (w.bounds.height-40).rand)
        );
        Pen.perform([\stroke, \fill].choose);
    }
};
w.refresh;
)

Best,
Paul