A puzzle: The mysterious piano of Eratosthenes
- 2013/12/25 05:29:47 投稿
- 再生数：136
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This is not a traditional piano. The keyboard is strange, yet it follows a very strict rule. If you add a new key to the right, what would be its colour? Black or white?HQ original: http://www.youtube.com/watch?v=WPXUeqixuOoContact me at: [email protected]: x_YAMABIKO_x