Do you have the strong urge to play with a Slinky, but sadly live in an apartment with no stairs? Don't fret! Jim Sellers has the solution: the Slink-O-Matic.
The device is pretty straightforward: place a Slinky on it, turn it on, and watch as it slinks back and forth, back and forth. Sure, it's not quite as magical as watching one go down the stairs under its own volition, but if that was so damned important to you maybe you should've bought a house with stairs.