title: Flagging early examples of ambiguity II.
authors.forename: Marco
authors.initials: M
authors.lastname: Piccolino
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Wade
mesh_terms: D001154:Art; D004616:Emblems and Insignia; D004864:Equipment and Supplies; D006801:Humans; D007514:Islam; D009903:Optical Illusions