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For just about any industry you can imagine, there exist semi-formal trend cycles that seem to be sort of accurate at least part of the time.

Fashion is probably the most visual and well-known of these cycles, with garment-professionals planning their releases based on how long it takes for styles to arise, go out of vogue, and then eventually come back into style with some new monicker: the original edgy or sexy replaced with nostalgic or quaint.

Whatever the contemporary trend-defining...