This is an implimentation of a Japanese soroban (abacus).

To begin, type m-x soroban. This will switch to your new virtual soroban.

Move over a bead <_> and press the left mouse button or spacebar to move it.

To clear the soroban press the c key or the right mouse button.

If you wish to learn the soroban, there are many videos and tutorials online.

Happy Hacking!

Ryan Burnside