translation.en: Here's an example from Hong Kong, where some kids made a game and then built their own physical interface device and had a light sensor, so the light sensor detects the hole in the board, so as they move the physical saw, the light sensor detects the hole and controls the virtual saw on the screen and saws down the tree.
translation.zh: 这是一个来自香港的例子， 一些孩子做了个游戏 然后做了物理设备接口 连了一个光敏元件，这样光敏元件 会探测到木板上的洞， 在他们拉动实体锯子时 光敏元件就探测到洞 并控制频幕上的虚拟锯子 并将树锯倒。