Phase-shifted torsos and impossibly acrobatic legs: the black-and-white tights dance

By Crom, what sorcery is this? These women with their motley tights have backdoored my brain's habitual human-recognition heuristics and keep fooling my eye into seeing impossible acrobatic half-humans with phase-shifted torsos!

Black and White Tights Dance (with "Tanz" lyrics) (via IO9)