A textual or pictorial expression designed reference to something without mentioning it explicitly. The allusion often is designed to indirectly call something to mind. Examples: Thomas Stoppard's dramas with textual allusions to Shakespeare and pictorial allusions (described by Margaret Aston in "The King's Bedpost", 1994) by the anonymous painter of "Edward VI and the Pope" (16th century) to the print "Ahasuerus consulting the records" (1564, Philip Galle after Maarten van Heemskerck.