Algodoo

A lineup of marbles glued together, on a 12rpm invisible axle using them to draw a circle of radial changing colors.

You may use this to copy and paste the postStep rainbow color-change script, or loosen the different colors to make them become a set of marbles. You can also attach thrusters to each of them and take the axle off to have them trace rainbow ribbon patterns in the air.

Controls(works on both mobile and PC):

Right for clockwise
Left for counter-clockwise
Down for break