大宝现在真是迷恋手影，晚上睡觉前关上大灯，开了小灯是他很快乐的时光。
趁机输入，此时不输入更待何时。
What makes the shadows? Where does it come from?
The sun is very bright. It shines on the house. It shines on the trees. It shines on you. But the sun does not shine through you.
There is a dark place behind you where the sun does not shine. The darkness is your shadow.
图片发自简书App
图片发自简书App
图片发自简书App
正好结合着《宝宝的光学》中的reflect 一起讲，还和他晚上一起做出各种各样不同的shadow pictures.
