Beauty matters. Certainly, most people would agree. Beauty is an important ingredient of our daily lives. We admire and praise the beauty of nature, architecture, music, other people – an ugly color or an awkward form easily repels us. Given its pervasiveness, the lack of research addressing beauty (or aesthetics) in Human-Computer Interaction (HCI) is striking (see Tractinsky, 2005). HCI seems a "science of design" (Carroll, 1997) that long neglected beauty.