The restoration of a favorite Ophuls film is streaming free all weekend:

Here's how I tried to summarize it for PFA decades ago:

It looks like working-class charm-school student Barbara Bel Geddes’s ship has come in when she's invited to a millionaire’s yachting party. She misses the boat but catches the millionaire, and soon our heroine is successfully ensconced in a Long Island Gothic mansion, waiting for her husband—bitter, driven Robert Ryan—to come home. One of the morals of this dark Cinderella story is that marrying money may bring security, but prisons are secure, too. So it’s no surprise that when Bel Geddes tries to trade a life of hollow luxury for the human chaos of James Mason’s Lower East Side doctor’s office, she meets with formidable resistance from her husband, who says “women are a dime a dozen” but insists on protecting his investments. Thanks in part to Lee Garmes’s deep-focus cinematography, the dream house has rarely looked so sinister.

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Basic models of flocking behavior are controlled by three simple rules: 1) separation: avoid crowding neighbours (short range repulsion); 2) alignment: steer towards average heading of neighbors; 3) cohesion: steer towards average position of neighbors (long range attraction). With these three simple rules, the flock moves in an extremely realistic way.