Find the Black Dot*

I'm not going to take credit for this one, since I didn't make it, but this certainly is
a neat visual trick, isn't it?

Ouch.  My rods and cones.

<---Back to the Realm of Niftyness
(there's about 83 times more time-wasting fun just waiting for you!)

*(T.R.O.N. is not responsible for the headache that you probably have right now.   Get back to my eye-friendly, brain-soothing black backgrounds by clicking on the link above ASAP, Sparky!)