RISD's CE program doesn't offer any of their three Color Theory classes online. And I didn't learn from a textbook. So offhand, I don't know. I'm sure there are online Color Theory classes, you'd just have to Google them. I'm sure there are decent books, for that matter. Google can help with those, too.
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Also, re the above explanation of the quilt: I love useful things that look like other things, so this is great!