Some additional stuff.

This is a gif I made applying simple local dynamic constraints that minimize the differences. In practice all bars minimize the efforts of moving in a certain way. The same effect has been put to use in the famous case where several metronomes come into synchronization when weakly coupled together. Rather than as an example of order emerging from disorder it seems to me a case showing the power of conformism. here.

The "crazy circles" illusion is a popular cinematic visual illusion. However, it is not strictly an illusion. To see why read here.

Akiyoshi Kitaoka has devised many amazing color illusions. However, they are not really illusions in the strict philosophical sense. Why? Check here.
You can also read this article on the same topic: The color of consciousness.

Afterimages are yet another interesting visual phenomenon. However there has been some persisting confusion on the issue. You may check some simple but significant experimental results here. (November 2015). You can also read this article on the same topic: The color of consciousness.

Are neurons any better than ripe strawberries in being red? Check here.

Reality, knowledge, and experience in one diagram. Check here.