> elegant foundation for computation.
-1, 0, +1 has as elegant symmetry that will inspire fascination until either someone can prove its inferiority with some heretofore unimagined model of computing or someone builds a clearly superior device based on it. I strongly doubt such a device is possible with contemporary two dimensional etched semiconductors; too many people have been torturing conventional mosfet circuits for too many decades to think they've left much on the table. But who knows what the future will deliver? Maybe we'll start computing with proteins next year and somehow 3 (or more) levels will make sense.