When the nun Chiyono studied Zen under Bukko of Engaku she was unable to attain the fruits of meditation for a long time.

At last one moonlit night she put a single blue button into an aluminum case and connected it to a simple USB controller. When she pressed the button Chiyono was set free!

In commemoration, she wrote a poem:

In this way and that I tried to make an accessory
Since it is important to experiment with USB devices
Until at last I pressed the button.
No more finger on the button!
No more keypress registered!

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