Might have been kryponite, Rap...

BTW, thanks, kat... I'd like to think that I learneda little something my second go-round thru college... I mean, the 1st go-round was to make my parents happy but going back and getting a degree in Fine Art was to make me happy...

BTW, on the subject of light... The Van Eycks (Jan and Hubert(, painted the "Aletrpiece in Ghent" in like the early 1400s and in the top center panel they painted jewels... No make that, they created jewels with paint (meduim and pigment) to such a degree that the jewels have a 3D quality and if you look at a jewel from one side verses the other there is a distinct difference in what you see in the way of color based solely on the differences of light sources from one side to the other...

This is kinda what we are talking about here...

B~