A succulent plant (Agave obscura) showing the impressions the branches and spines leave on their counterpart in front as they mature. I found this pattern to be quite interesting.
The original color raw file was converted to black and white using Silver Effex Pro from Nik Software. Further cropping and retouching took place in Adobe Photoshop CS5.
Technical data: aperture f/7.1, exposure 1/500th sec, ISO 100.