Damn interesting story on how a Wired.com writer purposely tries to disappear. If you find him, you win $5,000.
The human eye has a blind spot
where the optic nerve goes back into your brain. You normally don’t
notice it because your other eye and brain compensate to fill in the
missing information. Click here
to find your blindspot. The brain can also be confused by the above
image. It is static, but your brain interprets it as moving.