There are a lot of fascinating details hiding below the surface in the world of color. For instance ... remember the order of the colors of the rainbow. So it's red, orange, yellow, green ...

All right, I'm going to bring up another elementary-school art idea: The color wheel. Remember it? Basically, it's the entire rainbow in a circle. Shades that are next to each other here are ...

Add articles to your saved list and come back to them any time. In the corner of Melbourne’s new Science Gallery sits a huge, rainbow-coloured hamster wheel, an experiment at the border of art ...