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How does a light switch controlled by two different work?

At home, there is a dining room with two different light switches light the same control. I always thought that runs a light switch opening and closing the circuit controlling the flow of electricity to light. However, if the light comes on and off for two switches then how the circuit really works? For example, if I enter the room with two start-off switches and the light is off and make one of the switches, turning to light after walking over to another switch for turning too. Instead of giving more power to the light, turns off the light. This puzzles me because you should not open the circuit to another switch is physically closed.

The two switches are "single-pole double-throw" type, in which the pole thrown back and forth between two conductors. You run two parallel conductors between the two switches (they are called "superior" and "lower" cables). Each switch back and forth between higher and lower on the pole down, and without twisting the two poles to attach the power supply. So if both switches are in the upper wire, current flows, and if both switches are in the bottom of the wire, current flows, but if a switch is in the top and one is at the bottom, no current flows.

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