This is a false-colored atomic force micrograph of two types of molecules forming a mixed self-assembled monolayer on a gold surface. The two molecules differ in height by 0.2 nanometers, giving the appearance of ripples. This image was awarded first place in the photography category in the 2010 Science/NSF International Science & Engineering Visualization Challenge. The winning entries are featured in a special section starting on page 847 and at www.sciencemag.org/special/vis2010/. This image relates to the 2010 International Science and Engineering Visualization Challenge appearing in the Feb. 18, 2011, issue of Science, published by AAAS.