This is the earliest pinhole image formation experiment and the earliest cognition of rectilinear propagation 八条中的后三条叙述了反射（平面、凹面、凸面）镜成像现象。
2.
The magician changes a bill that works well mark to in a twinkling a seal completely of counteract the lock lock to live of the video frequency in the copper tube play to show 魔术师将绳子绕在手掌中，打开后三条绳子竟然变成了一条三色长绳，接头神奇的消失了。视频演示：
