One of the illusions I like is the perception that one is moving in relation to a stationary object, when it is just the opposite.

About a mile from here on a hardpan road is a grove of big spruce trees hovering over a mountain stream. The water has undercut the bank and several of the trees are in danger of toppling into the river in some not so distant winter storm. I like to seat myself on one of the tree roots that rear above the water and feel myself moving swiftly upstream. I feel almost weightless, the ride is so silky and smooth. Come to think of it, that's the kind of thing I did when I was a kid - neat to be able to replicate an old experience.