Algodoo

ultra fast rainbow that also can turn black from monochrome effect
script(poststep):
(e)=>{
math.cos(sim.time * 4) ^ 2 < 0.5 ? {
colorHSVA = colorHSVA - [240.0, 0.0, 0.1, 0.0]
} : {
colorHSVA = colorHSVA + [240.0, 0.0, 0.1, 0.0]
}
}
the loop:
red
lime
blue
red
lime
blue
maroon
green
navy
black
bl-
ack
black