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Glenn analyzes Equus and three other plays by Peter Shaffer, whose twin brother Anthony is the author of Sleuth and Frenzy, and finds that in each the two main characters interact like and display the traits of twins. He suggests that twins may have enhanced creativity. Among the reasons he cites are: regression to primary process thinking is easier for twins; a partner is present in childhood with whom a twin may share stories and even a secret language; twins—who are often looked at by each other and by others—have increased narcissistic pleasure in exhibiting; and the capacity that twins have to put themselves in the place of another helps in the creation of fictional characters. Glenn posits possible audience response to plays in which the main characters are, in the author's latent thoughts, twins. This response includes: unconscious appreciation of the characters as twins; appreciation of the characters as 'doubles'; increased perception of ordinary emotions when they are displayed in exaggerated form; and experience of Oedipal and other themes which might otherwise provoke too much anxiety if not for the distraction provided by the twin theme.