Jail Cell Dolly Camera Trick

From the show Manhattan. The shot was a pullback from the window of a jail cell, back through the bars, to find the lead sitting and writing. Cudos to legendary key brip Pat Daily for (as usual) figuring out how to make it happen. The bars of the cell are attached to the dolly, as the camera pulls back Pat and another grip grab them in place as the actor is slid in front of the camera. The result is seamless.