Indoor shadow

1. https://docs.google.com/presentation/d/10D0E8FrZdfSb79RiRTmsZXyoLzdEKkYd/edit?usp=sharing&ouid=103504930850611178085&rtpof=true&sd=true
2. 練習作hand puppet shadow.
3. 分組到臺上練習並體驗hand puppet shadow. 2人一組，一人拿手電筒照，一人比shadow
4. Guess my shadow: 一學生作影子，期他人猜影子。