1 A seminal work on symmetry in design is Elements of Dynamic Symmetry by Jay Hambidge, Dover Publishers, 1978.

2 A nice source for various combinations of types of symmetries in natural and human-created forms is Handbook of Regular Patterns by Peter S. Stevens, MIT Press, 1984.

3 See, for example, “The Status of Minimum Principle in the Theoretical Analysis of Visual Perception” by Gary Hatfield and William Epstein, Psychological Bulletin, 1985, vol. 97, p. 155–186; and “Facial Resemblance Enhances Trust” by Lisa M. DeBruine, Proceedings of The Royal Society: Biological Sciences, vol. 269(1498), p. 1307-1312.

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