I've read a little, slept a little, watched some television, taken various medications, and am feeling better. Now it is about time to go back to bed. :)
I love optical illusions and this one is excellent! Here are some more.
Another area of great interest to me is symbolism, and I have several books on the subject. Colors have different symbolic meanings in different cultures. Here is a link to Color Psychology.
Some interesting details from the above site:
The most romantic color, pink, is more tranquilizing. Sports teams sometimes paint the locker rooms used by opposing teams bright pink so their opponents will lose energy. (This article didn't mention it, but years ago I saw a television program about holding rooms in police stations being a certain shade of pink.)
People are more productive in blue rooms. Studies show weightlifters are able to handle heavier weights in blue gyms.
Yellow enhances concentration, hence its use for legal pads. It also speeds metabolism.