  Shells, when confined, can deform in a broad assortment of shapes and
patterns, often quite dissimilar to what is produced by their flat counterparts
(plates). In this work we discuss the morphological landscape of shells
deposited on a fluid substrate. Floating shells spontaneously buckle to
accommodate the natural excess of projected area and, depending on their
intrinsic properties, structured wrinkling configurations emerge. We examine
the mechanics of these instabilities and provide a theoretical framework to
link the geometry of the shell with a space-dependent confinement. Finally, we
discuss the potential of harnessing geometry and intrinsic curvature as new
tools for controlled fabrication of patterns on thin surfaces.
