@jgpittenger Thanks, taped colored paper together then placed them at a 90 degree angle so it was like an opened book. I used a vase full of water and played. Here is a youtube video which has the same basic idea. ( https://www.youtube.com/watch?v=O-YT6fmDPrU ). I met Amy in the Flagstaff Photo Club, she is very nice and teaches at NAU. Northern Arizona University.