Filmstrip Conveyor

Six 240×160 white-framed cards form a conveyor belt moving left at a constant 176px/s; the card passing the centre line scales continuously up to 1.08 and brightens by its distance from centre (not triggered at a point); when the narration reaches the fourth card the belt decelerates by a position–time piecewise integral (constant → 0.5s decel → 0.25× slow for 1.4s → 0.6s accel → constant) so the deceleration ends exactly with the fourth card centred; once all six cards have passed the centre the whole thing exits