title: Geometric-optical illusions: an update on the output of publications.
abstract: The count of publications on geometric-optical illusions and the bibliography of extant books on the topic are brought up to date. The number of publications now exceeds 1100 and the number of books is 35.
mesh_terms: D005556:Form Perception; D006801:Humans; D007088:Illusions; D009903:Optical Illusions; D011643:Publishing / Q000639:trends*