To see and experience and be reduced to weeping while watching Model Shop — and not just to log it on this site, not just to say "I have seen a Demy film" — is to talk about cars. That goes for the rest of the films Demy made in the 1960s. It's not enough to have your mind evoke the pastel costumes, the musical numbers, the tone of daft fantasia: to have a position risks detouring us down the…