Minecraft wiki entry for Logic, associated text: In reality, the usual implementation is a NOR gate with inverted inputs (). Taking the inputs and , the first two torches (at the top and bottom of Schematic (A) below) invert them into and . The redstone wire between these torches serves as an OR gate, and is therefore in state , which can be interpreted as by De Morgan's Law. Finally, the third torch (the center-right one) applies a NOT to that statement; thus it becomes .