My students were just finishing our circle explorations at the time, and I haven't been using mindmaps this year, so I asked what they could read from this one.
1) List all the things about circles that you can find in this picture.
2) Is there anything missing that should be in there?
3) Is there anything that you don't understand?
A chord was only thing they thought was missing. And some of them didn't understand the circles filled in with yellow and surrounded by yellow, but others did. And they were very excited to realize how the colors helped (and they noticed the one spot where the colors didn't quite match. We figured that was when the idea started.)
I have tucked this away for another discussion next year. Thanks Alana.