For some reason this has been coming up lately, so: The moon on the water idea.
If the moon is being reflected onto running water, it is at the same time moving and not moving. It is not moving, because as a reflection it doesn't inherently move. But at the same time, it is moving because the water that it has its odd sort of existence on is flowing, rippling, &c. So this operates as a kind of zen koan in its paradoxical nature, similar to the more conspicous 'something is nothing, nothing is something' idea, and as such in its zen quality can be applied to nigh anything else - yay for somewhat subtle memes, much more pleasant than say, organized religion.