Hampture pretty much already existed in Earthworm Jim, as the "Down The Tubes" level. It's an underwater city comprised of transparent hamster tubes, habitat enclosures, and hamsters that run around inside:
|
The underwater elevator scene from Secret of Nimh was also an influence:
There was also the general "High tech shit built for small creatures to use" seen in stuff like Rescue Rangers, but Down the Tubes and Secret of Nimh were the main ones that led me to seriously consider the practicality of building this kind of shit.