ISN'T TIME-LAPSE photography totally excellent?
As Roger Hangarter explains, "plants grow and change on a time scale that is too slow for us to observe in real time. Time-lapse photography is a simple technique that allows us to see the movements of plants and clearly demonstrates that plants are living and capable of some extraordinary things." For example, you can watch the negative gravitropic response of a Coleus shoot after being placed on its side. The images here show what happens after about an hour.
Roger Hangarter -- "Plants-in-Motion"
Christoper Bahn --"Incoming signals"
John Walkenbach -- "Plants in motion"