Below you will find the two art files that make up the wheel. If you print both out, cut along the lines drawn on the top wheel (the two windows by "Objects" and "Freq, Wavelength, Energy" are left as flaps...so only cut the 3 sides shown. The small window near the center of the wheel gets completely cut out and removed. Grommet the two wheels together. If you don't have a brass brad, get inventive! The two wheels should be held securely in place, one on top of the other, but they should be free to rotate relative to each other.
You know you've done it right when you see a region of the EM spectrum show up in the open window and the "W,F,E" and "Objects seen" that correspond to that region showing up under the flaps.
This site currently under construction to become 508 compliant.