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Thrift is beautiful. There's an ęsthetic delight in efficient design: in the clean aerodynamic lines of a glider, the precise synchronism of a ballet, the smooth meshing of gears in a chronometer, the crisp language of a sonnet, the sleek body of a hare. Mathematicians capture this in two words: necessary and sufficient. The ideal proof wastes nothing. Every iota of input is used, and every possible consequence is deduced --- total economy of means and ends.
(correlates: ProcessVersusOutcome, PrincipiaPrincipia, PrecisionLiving, ...)