The issue with making an AND gate is you need a mechanical nonlinearity of some sort. Electrically if you define 1 as true and -1 as false (even though this is

The issue with making an AND gate is you need a mechanical nonlinearity of some sort. Electrically if you define 1 as true and -1 as false (even though this isn't the traditional definition), a NOT gate is just a flipped wire pair, but an AND gate would require a semiconductor.