>They might also see images of falling Tetris shapes at the edges of their visual fields or when they close their eyes. I get an effect similar to this after p

>They might also see images of falling Tetris shapes at the edges of their visual fields or when they close their eyes. I get an effect similar to this after playing airsoft, except it looks like BBs flying towards me. What I find interesting is that it's not all-that common while playing to see BBs flying towards me. It happens several times a game, but only for seconds at a time. So if this is the same effect (not just a different one with similar symptoms), it's not caused simply by an overload or repetition of a particular stimulus. (It's not just me: my friend said he gets the same effect. But I haven't asked around, so I couldn't say if it's widespread.)