Experimenting with the dark (or the light) side of the force was only possible if you were close to Vader, or a Jedi. That is, until now. This simple little innovation allows any ordinary person to try out either side.
Any ordinary light switch can be turned into this with just a little bit of paint. Keep the switch to the black end at normal times. Whenever you think the dark side is getting too strong, just flick the switch the other way.
Both Lord Vader, as well as Luke Skywalker, would be proud. Do try using a better font though. And keep it hidden from Yoda. He always makes a fuss and ends up complicating things.