Does anyone have the link that Simon P posted somewhere or other where you stare at it for 30 sec and look away and it’s like you’re tripping??  Can’t find it…

Here’s a drug-free high for ya, courtesy of Bill Burroughs. All you need is an old record player and construction paper. About ten years ago you could get these glasses that flashed patterns on your closed eyelids and those worked on the same principal. This is the original. You might not think it, but these devices are incredibly effective at creating vivid colourful geometric hallucinations behind closed eyes.

http://en.wikipedia.org/wiki/Dreamachine

Wish I’d a kept my old record player!
I found that link, btw, http://www.neave.com/strobe/