English: Author: Eiko Ikegami This image was by originally photographed by Professor Ikegami and used with her permission by Professor Hut, the subject in the image, on his academic homepage http://www.ids.ias.edu/piet . This image was uploaded to Wikipedia with their permission and on their suggestion for use in the article on Professor Hut, having been copied by the uploader from that homepage with cc-by-sa-3.0 licensing.