Emiliania huxleyi - single-celled marine phytoplankton that produce calcium carbonate scales (coccoliths). A scanning electron micrograph of a single coccolithophore cell. Taylor (University of North Carolina Wilmington Microscopy Facility)
So is it art? This is the structure of a plastic bag that can be seen under magnification. Photo taken in polarized light by Zdenka Jenikova, Czech Republic.