Stained glass window depicts EM spectrum
This stained glass representation of the electromagnetic spectrum may be seen at the Smithsonian National Air and Space Museum. The dangly yellow part represents that band of the spectra which makes people think that non-ionizing radiation gives you cancer.
Deputy Dog has a whole collection of geeky stained glass windows up today, which includes a cute Link by Lynda Macrae, a not so cute Pyramid Head by Deviant Art's Laernath, and the classic pixels of Cologne cathedral.
when geeks and stained glass collide [DD via Make]

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Here's another example of geek-meets-stained-glass...meets steampunk
http://www.flickr.com/photos/bloodyveg/2709373471/