"I use the term "Imprevionism" to describe a technique of mixing many photos from the time-lapse sequence. Irregular, random patches are copied from several photos to show different lights and colors during the day within the same picture. I thought about this effect many years ago. Recently I have made some progress with this technique, but I'm still not sure if it makes sense to others. For mixing those photos I was using program I wrote in Processing programming language (http://www.processing.org), which is just great. Obviously, I was inspired by Impressionism."