Dance review: William Forsythe at Sadler's Wells - Our shocker-in-chief runs out of moves
Pushing the envelope. It's a strange phrase, is it not? It appears to have crept into general use in the late 1970s, having originated in the field of maths, where the "envelope" describes "the locus of the intersections of consecutive curves". Within that locus, then, is charted territory. Pushing its limits enters the unknown.
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