????? ? ??? ??? ?????? ??? ??? ? ???, ??? ????? ?? ?? ??? ???? ??? ???? ??? ??? ??? ??? ? ????.[sixty nine] Very small plastic or glass marbles could be Employed in highway marking like a reflectors to reinforce its visibility by motorists during the night. Resulting from a A lot larger refractive index, rainbows observed on this kind of marbles ha