“Whatever is needed in the restaurant is packed in special wrappers at a depot in the town. Everything is then placed in the pipe, which is filled with a special liquid, and pumped to the restaurant on the roof. The liquid allows packages of different weights to float. Otherwise small packages would float while large packages would sink and bang against the bottom of the pipe. When the packages reach the restaurant they are taken from the pipe, unwrapped, and put into the right containers.”
