Newton's Color Wheel: It's All Over the Web

"Newton's Color Wheel"
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About a half-dozen photos, and a discussion of why the disks look different when they're spinning.

There's a more detailed (and authoritative) posting at Kenyon College's website:

"Newton's Color Wheel"

-which is part of

"Instruments for Natural Philosophy"
Thomas B. Greenslade, Jr.
Professor Emeritus of Physics
Kenyon College, Gambier, Ohio

If you're still hungry for web pages about this sort of thing, go to Google, and use these three words as your search terms: newton color wheel.

Have fun.