Several places around my house there are lights which are connected to two different light switches, at either end of a staircase or at either side of a large room. So you can turn the light on or off by flicking either switch.
Whoever installed these switches had keen insight into human psychology. Because with each pair of switches, when the light is off one switch is upward and the other switch is downward. Yes, that's the right way to do it. Because imagine if lights off meant both switches upward or both switches downward: imagine how us compulsive-obsessive types would then feel driven always to have both switches pointing in the "correct" direction when lights were off!
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