1 The seminal work on good continuation 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. See also Principles of Gestalt Psychology by Kurt Koffka, Harcourt Brace, 1935.

2 See, for example, Elements of Graph Design by Stephen M. Kosslyn, W. H Freeman and Company, 1994, p. 7.

3 See, for example, “Convexity in Perceptual Completion: Beyond Good Continuation” by Zili Liu, David W. Jacobs, and Ronen Basri, Vision Research, 1999, vol. 39, p. 4244–4257.

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