recursion
Hofstadter's Law
An Idea by Douglas HofstadterIt always takes longer than you expect, even when you take into account Hofstadter's Law.
Nested
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Strength from both mass and form
Hoover Dam has the shape of an arch dam, but it is actually a hybrid structure, gathering strength from both mass and form. The dam is often ranked as one of the most exquisite of all engineered structures. It is fitted to its site so well that the gnarly canyon wall looks like an organic growth engulfing the mass of concrete.