An untitled work by Katinka Matson, via John Brockman and EDGE.org. The artist's site is here, and you can view a larger-size image here (fun to gaze at on an iPad, I think).

Update: Boing Boing reader Jennifer Forman Orth, Ph.D., who is an Invasive Plant Ecologist, says, "That's actually a scan of the seedheads of a Clematis vine. So not a flower, not anymore - already pollinated and gone to fruit. But a small technicality for that beautiful image."