I vaguely recall a nozzle that squirted out a giant drop that hit the ground bounced, quivered and snapped into the shape of a bungalow.
It was a house shaped mold that had two big arms. They would pour a bunch of stuff in a hole in the top, the whole thing would shake vigorously and the arms would lift up the mold to exponse a nice little bungalow complete with lawn and picket fence. Then it moved to one side to make the next one.
The 1939 worlds fair is my favorite. I used to have an “ephemeral films” laserdisc that included a lot of the films from the fair and about it.