Is it the shape of the cavity, or the shape of the water in the cavity? Phillip W. Snyder, Matthew R. Lockett, Demetri T. Moustakas and George M. Whitesides Eur. Phys. J. Special Topics, 223 5 (2014) 853-891 Published online: 02 May 2013 DOI: 10.1140/epjst/e2013-01818-y