Yesterday I posted a riveting image of a paper towel with a patten of dots and circles. Today, I converted that image to black and white, and added it as an overlay on this image I shot last spring (ah....spring....) of some crab apple flowers. Look closely, and you can see how the dots and texture in the overlay roughs up the surface of the flowers and branches. It's subtle, but it's there. Compare the two images zoomed in and you'll see.