Gadgets! Gadgets! Gadgets! All About How Gadgets Can Make Life Better and More Enjoyable

Let say there is a living room with 2 wall switches (switch A and switch B), both controlling the same light fixture. Currently both switches have their handles flipped down. Now I walk to switch A and flip the handle up, and the light fixture comes ON. Then I walk to switch B and flip the handle up, and the light fixture turns OFF. Finally I walk back to switch A and flip the handle back down, and the light comes ON… How is this possible?? I thought a wall switch is always “up is ON and down is OFF” (or vice versa). But according to the above example switch A can be ON when the switch is up / down, depending on what the other switch did previously… So technically the switches only “change state” when flipped to the opposite direction, instead of opening / closing the contact?? … How does this happen mechanically? So the circuit is neither in series or in parallel??