I was bored today so I took this diamond shaped crystal made of glas and simply put in infront of the light emitting from the sun. What I noticed was a lot of lines on the wall that were strangely colored, just like the electromagnetic spectrum. One end was blue, then progressively went to red, inbetween was green/yellow. Can someone explain how this happens? The photons from the sun entered the crystal in it's pointy area rather than the top of it. Bonus question: When I stared into the crystals radiation emitting from it, I noticed that the color keept on shifting all the time. First it was blue, then yellow, then red and green and so on. Why?