Just google "Trizonal space warper" or (
click here) to try it.
This isn't exactly a full on substitute for the whole LSD experience, just one of the fun aspects of it. I learned about this back in the early '80's in Omni (science) magazine. There was a tear out that you could put on a turntable and spin at 33 1/3 rpm's.
A TSW is a very peculiar optical illusion. The effects on the visual sense are dramatic and inexplicably similar to what LSD might have, but it's temporary, harmless, free, and simple. You can have all sorts of fun with it - for 10 seconds or so each time.
You're welcome - go nuts!
If you're currently under the influence of real LSD then
click hear.