On Wednesday, June 19, 2013 12:57:58 PM UTC-4, Doug Miller wrote:
wrote in

:

With an even number of switches, you will always have an even
number of switches in a certain position with the lights off.
Either four down, two down, or four up.

This is untrue.

Want proof? Set it up so that the lights are off when all four switches are down.

Now turn one of the switches upside down. The lights are still off, but now there are three
switches down, and one up.

So do you wander through the house flipping switches over in electrical boxes on a daily basis?

If he wires it up so that all four are down and the lights are off, and LEAVES THEM ALONE, then the lights will be off with the switches in three states:

1. Four down.
2. Two down.
3. Four up.