Twinkle on the edges of the colour triangle (enhancement)

[matteoferla]

A potentially fun talking point, albeit school-level physics, is sampling not within the Maxwell colour triangle, but the edges for fully saturated colours. Namely one gets two random values and letting the third be zero.

def random_color(max_brightness:int=1):
    colors = [random.random() * max_brightness, random.random() * max_brightness, 0.]
    random.shuffle(colors)
    return tuple(colors)