The technical term for this is LENTICULAR. But yes Teebin, like you said, for that to work in my opinion you only can move ever so slightly for the image to change, and once youve gone too far, it would "reset" so to speak.
OK...screen goo, 3d without glasses, peripheral vision...Im gonna go out on a limb here and say there are hemispherical screens that encapsulate the ride vehicle as it moves. I mean we have all seen them in the photos that Shellemonster (I think it was) posted several weeks ago. the only problem i have with this idea is that it would have to be rear projected if it covers the entire bench. i like these riddles scott, keep them coming. its alot of fun.