It's the full text of the Mumonkan aka The Gateless Gate, with a major modern upgrade. Each of the 49 cases has a small interactive diorama. The whole book can be read aloud with over an hour of speech, and each scene has its own quiet soundscape made from whatever is in it.

Source: [Hacker News](https://killedbyapixel.github.io/GatelessGate/)

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