1 The seminal work on closure is “Untersuchungen zür Lehre von der Gestalt, II” [Laws of Organization in Perceptual Forms] by Max Wertheimer, Psychologische Forschung, 1923, vol. 4, p. 301–350, reprinted in A Source Book of Gestalt Psychology by Willis D. Ellis (ed.), Routledge & Kegan Paul, 1999, p. 71–88.

2 See, for example, Understanding Comics: The Invisible Art by Scott McCloud, Kitchen Sink Press, 1993.

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