title: Nonphysical visual objects generated by colour spreading are expected to cast shadows.
abstract: Purely visual objects created by colour spreading are expected to behave like any other physical object. In particular, they are expected to block light and to cast shadows.
authors.affiliation: Institut Jean Nicod, CNRS-EHESS-ENS, 29 rue d'Ulm, 75005 Paris, France. casati@ehess.fr
authors.forename: Roberto
authors.initials: R
authors.lastname: Casati
authors.forename: Roy
authors.initials: R
authors.lastname: Sorensen
mesh_terms: D003118:Color Perception; D006801:Humans; D009903:Optical Illusions