I always had that problem when I was your age Jim, mabe it is just the heat here in Australia . I found it got worse if I did not eat properly, under stress etc.
I can still actually make that sensation happen now - as I just chose to look at it as an interesting thing and started playing with it in my mind. The mind is a powerful thing, if you work hard at controlling these things it can work.
Also, get your eyes checked 
I can still actually make that sensation happen now - as I just chose to look at it as an interesting thing and started playing with it in my mind. The mind is a powerful thing, if you work hard at controlling these things it can work.
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It's interesting that you should say that, because when I was much younger (maybe 7-9) I could watch the ceiling of my bedroom and actually watch the protruding, decorative bumps invert. I could see the roof as a smooth, white surface with many holes in it, as opposed to a rough bumpy one. Also at town hokey games, if I focused on a space of nothingness between the players and the chainlink fence for long enough, I could eventually see them skating in the air before me and infront of the fencing. They were as small as they seemed in the distance, and it was kind of like an odd hologram, but if I blinked or lost the ... flow I guess or however I can explain it ... then the players would dip behind a chain or two and eventually I would snap out of it.
Anyway ... I'm on Dex as well, and when I first started a couple of months ago I experienced things moving. I even had some bad headaches or headspins more like whenever I got in a car. But I know now it was because I wasn't eating right, not having an appetite and all. I wonder if it's the same for you? Still remembering to cram in your protien, vegtables and dairy and whatnot?
It was scary, because after the first month I had realized that I'd lost just over fifteen pounds! Scary... it's a good thing I wasn't already too skinny or I might have gotten very sick. But I'm better now.
I've noticed that when im on the pills, and i see a pattern somewhere, occasionally i'll get really annoyed or angry, and the pattern will distort. for example, i was walking down a brick path looking at the floor, and the recurring brick pattern started screwing with my head. the lines between the bricks started moving up and down like a tv with bad reception. does anyone else have this problem?