Not sure if these actually work, but it’s an interesting read anyway.
I think I’d like to try out the ping pong ball thing, but half an hour is a long time and I have a feeling it could be disappointing. From the descriptions in the comments it sounds like when you push your eyes and get weird shapes and colours.
On the other hand I have plenty of time, a radio, and a red lamp.
I just need to lift myself from ping pong poverty.
From here.
Image: Dali.
