Algae-covered tufa
This is one of my favourite places and somewhere I always find worthwhile photographic opportunities - no matter how many times I visit.

The tufa attracts algae on the edges of each small cascade. I was struck by the patterns it made and how this shaped the flow of water.
Location: Cascade de Tufs, French Jura
Date: 03.2013
Medium: 5x4 colour negative