Turntable

A turntable is a motorized device, that is designed to rotate whatever is sitting on top of it, such as a car, into the opposite direction that it was previously pointing.

The Mole family's house was on top of a turntable, which allowed it to rotate, making it appear as a truck garage from the road, putting the front of the house into the backyard.

The reason for this was because the Moles used the backyard for spelunking toward Molesville in their drillmobile.

External Link

 * Turntable at Wikipedia