Inexpensive and easy-to-build, it is made of a couple of wires, basic electronic components (easily found at any Radio Shack), a switch and a natural power supply (a potato for example).
The Stepper Box (or just ‘stepper') has a three way switch on top of it, one marked ‘west', one 'off' and the last 'east'. 'West' and ‘east' are the names given to the two directions of travel possible through parallel world chains - flicking the switch to either causes the user to be transported one planet in that direction.
In The Long Mars, is it revealed that the Steppers also work on Mars. Compared to their Earth analogs, the Mars Steppers have to be powered by Martian cacti instead of a potato.
- ↑ A Blink of the Screen: Collected Shorter Fiction - The High Meggas