As a motto, "do it yourself" covers models of production ranging from the arts & crafts movement to IKEA, and from the Sex Pistols to Marcel Duchamp’s readymades. The flagship DIY store in France, BHV, is paying tribute to the readymade aesthetic — "assisted" and otherwise — with a special retrospective of Duchampiana that opens Thursday. An illuminating segment on France24 provides an unusually literate overview of the readymade universe, its connections to home improvement retail and its antagonism to the tyranny of the retinal. (Following a roughly 3:30 Katy Perry segment.)