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The XOR Gate, easily visualized

The easiest way I could think of to demonstrate how an XOR logic gate works in Portal 2 using lasers. This logic gate was made of three laser emitters and three laser receivers.

The two buttons are the binary input and the fizzler field is the output. The output is only on when a single input is on. The logic gate essentially acts like three light switches all wired together.

The traces are all clearly drawn on the ground so you can see the connections happen as they're made. None of the traces cross over each other in this pattern, ensuring it's all easy to see and understand.