Colour Spinners

Colour Spinners

We have seen that white light (sunlight) can be broken into the colours of the rainbow with a glass prism.

I wonder what would happen if we could spin all the colours of the rainbow?  Could we make white light?  What other colours could we spin to get different colour combinations?  Could we use our fingers or a toothpick or a motor to spin the spinners?  Which would work best?  Are there other optical illusions that we could enjoy trying?  What is a Benham disc and how does it work?

We found the answers to all these questions (and had a lot of fun).  Be sure to ask us all about it!