Color Fields Colr Pickr

This has got very nice colours on it, but there doesn't seem to be any explanation of what it's for or how to use it.

torreaux

I wonder what language "torreaux" is? The stadium looks very full - I don't know whether you would find so many people at a bullfight today: I believe the "sport" is losing popularity. I saw one on television when I was in Spain a few years ago, and it was quite sickening.
The photo I'm talking about it "torreaux", in the George Eastman House Collection.