For a photography project I have to convey the passage of time, i.e. somehow demonstrate that time is passing. I can demonstrate this by any means I want, it doesn't necessarily have to be through a picture (although most projects probably will be done with a camera). I have some ideas in mind already about how to show time is passing but i want to see if anyone else has something that might better convey this. My current primary idea is to take a picture of a river or waterfall with a long exposure time so the water blends together to show its moving, and therefore time is passing. Does anyone have any other ideas?