dcclark (David Clark) says the he's a mathematician, photographer, explorer, improviser and that the combo works surprisingly well! He lives in Houghton on the Keweenaw Peninsula and runs a cool blog called Cliffs and Ruins with photos from his journeys (and a little math). You can view and purchase his work at dcclark.net.

His sets include Spring, Winter, Shapes & Colors and Keweenaw Ruins (slideshow).

Here's Dave's Flickriver...