Prism and Spectrum
The light/prism/spectrum of colors is a metaphor for conversion or a catalyst for separation. It can also be used effectively to show transformations and arrays.
There are three PowerPoint downloads. The thumbnails have a description of the characteristics for each. The prism part of the illustration can accept both line and fill colors, although you may want to keep it as a semitransparent light gray so that it looks like a stylized crystal. The light on the left that goes into the prism and the spectrum of colors on the right that go out of the prism are PNGs and cannot accept line and fill colors. They can be recolored as a picture in PowerPoint 2007, but doing so may make the concept less effective. The light shows up best against some sort of background.
Key search words: prism, spectrum, catalyst, conversion, separation, transform, array, rainbow, crystal, refraction
Keywords: prism, spectrum, catalyst, conversion, separation, transform, array, rainbow, crystal, refraction