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Necessity of shapes for coherence results in category theory
See Section 5 ("Coherence and canonical maps"), p.29:
Hence, this theorem really amounts to the statement that, in a monoidal category, every diagram of canonical maps $a, b, c$ must commute. … On Mac Lane's conditions for coherence of natural associativities, commutativities, etc., J. Algebra 1 (1964), 397-402. MR 32 #132.) …