Water

I'm sitting here at work, and I found myself staring through a water bottle trying to make out the shapes on the other side. I realized just now that the light shining through it making a very faint rainbow in a lot of different places, and my first thought was to tell my lighting class about it! The light is shining through the water and hitting the plastic, and it is being separated into all the different colors that make up white light. It's really interesting to me that this probably happens very often in multiple places, we just never pay attention to it!