Check out this cool iPhone app from Japanese coder Kako-san.
In many parts of Asia, the Abacus is still used today,, mainly to teach maths, so Kako-san decided to make an abacus app for the iPhone, here is a video of it in action.
As you can see from the video, the beads can be moved up and down, and if you shake the iPhone they will reset.
The source code can be downloaded in a zip file here.
Source: Crunch Gear
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