Waterbed theory

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Waterbed theory is the observation, ascribed to Larry Wall, that some systems, such as human and computer languages, contain a minimum amount of complexity, and that attempting to "push down" the complexity of such a system in one place will invariably cause complexity to "pop up" elsewhere. This behavior is likened to a waterbed mattress which contains a certain amount of water; it is possible to push down the mattress in one place, but the displaced water will always cause the mattress to rise elsewhere, because water does not compress. It is impossible to push down the waterbed everywhere at once, because the volume of the water remains a constant.

Waterbed theory has been cited as a significant part of the design philosophy of Perl 6. [1]

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