I noticed, Leon, that you did some sort of multiple exposure for your waterfall pictures. You attributed this technique to Les, if I am not mistaken. So if either of you or anyone else who understands this technique could help me out, I'd really appreciate it!

Here are my questions....why did you do multiple exposures? What is this method (ie..how do you do it)? Is there a time when this method is better than a single long exposure?

Thanks in advance, oh great masters!
signed "Grasshopper"