“The Game Show Host Problem” from the movie 21 (2008). Photo: © 2008 Relativity Media

Sketch by Pearson Scott Foresman, Wikipedia Commons, Public Domain
An astrolabe for memory (Enrico Visani), Wikimedia CC 4.0
My personal copy of the special DVD edition of Memento.
Image from Jess O! Tricky Cad & Other Jessoterica, Siglio, Los Angeles, 2012. Used with permission.

Ronald Boothe

Professor Emeritus, Emory University, Atlanta, GA, USA

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