each finger would represent a power of two, and you just "select" if it's on/off or included in the total to represent a number.

so on your right hand:

thumb - 1
index - 2
middle - 4
ring - 8
pinky - 16

to show 'one', just show the thumb
to show 'two', just show the index
to show 'three', show the thumb and index because 1+2=3
to show 'four', just the middle finger

on one hand you can count to anything that is a combination of 1, 2, 4, 8, and 16

add more hands and feet and you can add larger powers of two, so 32, 64, 128 and so on, and can count even higher.


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