LED and CD

I took my LED light and shined it at a CD i had laying around. The way I got it to reflect was pretty cool. It made a blue ring around the CD and if I tilted it certain ways it would make a little green in the ring also.And the closer and farther I pulled the LED away I could make it a full circle rainbow on the CD. It's pretty cool to see what you can do with LED's and CD's.