This video demonstrates how the LEGO light switcher I made works.
Rest assured, I did not damage my home's electrical or structural integrity in any way. As you can see in the video, the device can be easily removed and the light switch can be used the old-fashioned way. Why anyone would want to do that when they have this awesome device is another matter.
In the video, I'm controlling the light switcher with the RCX remote, but it can also be controlled from my computer via NQC commands (See this earlier post). It will soon become apparent why this method of control is useful...