Digital Abacus

Abacus are defined, according to wikipedia, as a hand-operated calculating counting frame tool which was used from ancient times.  Abacuses usually consist of top and bottom beads. If the beads meet at the middle bar, it represents a number. The top beads usually has a different value of than the bottom beads. This abacus I designed specifically for base 10. 

thanks to  

Doggy

aaaaaugusttttt

kirillvp