Today in class I shared a few links to sites that demonstrate principles of sensation and/or perception.
The Rotating Cat Illusion was a popular one. The cat appears to rotate one direction initially, but if you stare at it long enough it will seem to reverse directions. Different people have different initial perceptions of it (some see it rotating right, others left). This is a great illustration of how the exact same sensory stimulus can elicit different perceptions from people. A related illusion that you might be familiar with is the Spinning Silouette illusion, which is often INCORRECTLY described as a left/right brain personality test.
Note: if you are accessing this from school, the district's filters might block the cat website. Try Googling "spinning cat illusion" and maybe a site that you can access will be available.
For those of you interested in the backmasking and reverse speech sites, here are the links: