This week's experiment is one that I have been playing with for quite some time. It is something that I first noticed when I was a child in school. Way back then, we watched educational movies sometimes in class. There were no VCRs or video tapes. Instead, the film was on big reels and fed through a movie projector. When the movie was over, you would rewind the film back onto the reel, and as the reels were spinning quickly, you could see bands of yellow and blue light, like the spokes of a wheel on the reels. Since then, I have found several other ways to see these blue and yellow bands. For this demonstration, you will need:

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