What’s happened to the waterfall? Why is it green?
The answer is rather subtle and ingenious. Sean Lenz and Kristoffer Abildgaard dropped high-powered Cyalume glow sticks in a variety of colours into various waterfalls, and captured the results using long exposure photography (varying from 30 seconds to 7 minutes). The final product is a stream of colour that is eerily beautiful and alien. More images can be found over at Colossal.
Onwards!
Richer Ramblings 
great photo wonderful and inspiring idea. thank you so much for sharing (-: