Abacus

If you were in a *really* sadistic mood, you could make up some binary abaci and do a visual computer - 32 pegs; one bead per peg. All the algorithms are established for doing *lots* of things with an abacus like that. If you had enough of them, you could run Word 6.0!

We have a pair of binary abaci on our hands, with which we can count up to (but not including) 1024.

Hold your two hands, palms facing you. Put all fingers down. This is 0.

Now lift your left thumb for 1. Your left forefinger is 2, left thumb and forefinger 1 + 2 or 3.

The binary digits:

	Left thumb		1s
	Left forefinger		2s
	Left middle finger	4s
	Left ring finger	8s
	Left pinky		16s
	Right pinky		32s
	Right ring finger	64s
	Right middle finger	128s
	Right forefinger	256s
	Right thumb		512s

The binary abacus is useless for arithmetic, but I occasionally use mine for counting.