My class was working on color and we where talking about how the eyes plays small tricks on the brain. This is a really good test to take to see that the avarage person may find them self seeing things that are there and that are not there.

as the eye picks up and send in data to the brain we can find out mind working out small detells on what the eye and the rod should be sending the correct data as this test you take will prove to you that the brain can switch the data brought in to element the focus short and long to change that small amount of data the mind can see with its eyes.

 

http://jvsc.jst.go.jp/find/mindlab/english/base.html