The Prelinger Archives have a wonderful video from 1959 explaining the concept of Polymorphic Computing, otherwise known as distributing computing power using a whole host of machines. This is definitely an interesting and fun video to watch for anyone who loves computer history.
From the Archives: Simon Ramo’s concept of “polymorphic” computing is laid out in stop-motion animation, accompanied by acoustic guitar. The film anticipates parallel, distributed processing and the architecture of ARPANET and the Internet.
Note: The video can be downloaded and is listed under a Creative Commons license.