yup.. hehe
Spent yesterday fiddling with some high-brightness LED's, a pair of sunglasses, and some really basic code to make a Purkinje (?sp) stimulator, aka Dream Machine. Reverse of a strobe, you flicker a light at 4-20Hz in front of closed eyes and you get very complex pattern hallucinations. Has to do with the way the visual cortex operates. With the arduino, it's nothing at all to write a program which varies duration of the cycle and flicker, uses PWM to control brightness, or even drive a RGB LED on 3 PWM channels to give fine grain spectrum control. The most basic version- one LED and a resistor.. and the project is DONE except for the code.
Neverending fun from these little buggers...by the way, I'd be remiss if I didn't mention the above project can cause some people to have seizures....