> I really have a soft spot for the Fredkin, it just seems so elegant. I agree. It’s so simple, yet it easily leads to other seeminly-more-complicated gates,

> I really have a soft spot for the Fredkin, it just seems so elegant. I agree. It’s so simple, yet it easily leads to other seeminly-more-complicated gates, simply by ignoring some of the inputs or outputs. Plus it has the feature that the # of on inputs always equals the # of on outputs. And the feature that it’s reversible. Really a cool gate all around.