We can see an object because when a beam lights on an object, the object itself reflects light to our eyes, consequently we can see the colour, the shape and the shadow of an object.
There is a few methods that the shadow can 'hide away' from the object.
Speed
If the object moves fast enough, the shadow would be hard to notice.
Bruce Lee Speed Demonstration
For those who only know the 'Comedian Kungfu' guy Jackie Chan, I am going to give a little introduction on Bruce Lee. Bruce Lee is a great martial artist, but also an actor and philosopher. He invented Jeet Kune Do (A type of Martial Art), which is strongly focus on speed, and how body should flow like water (water is soft, but it also can crush). The video was taken in late 1960s, the video has poor quality and its in slow motion, but you can still clearly see how fast Bruce Lee can punch. It is claimed that no one can actually see clearly how he starts his punch, until they felt his fist was actually in front of their face after second.
Bruce Lee has clearly shown it is possible to hide away the shadow when an object has reached to a certain speed.
There is a few methods that the shadow can 'hide away' from the object.
Speed
If the object moves fast enough, the shadow would be hard to notice.
Bruce Lee Speed Demonstration
For those who only know the 'Comedian Kungfu' guy Jackie Chan, I am going to give a little introduction on Bruce Lee. Bruce Lee is a great martial artist, but also an actor and philosopher. He invented Jeet Kune Do (A type of Martial Art), which is strongly focus on speed, and how body should flow like water (water is soft, but it also can crush). The video was taken in late 1960s, the video has poor quality and its in slow motion, but you can still clearly see how fast Bruce Lee can punch. It is claimed that no one can actually see clearly how he starts his punch, until they felt his fist was actually in front of their face after second.
Bruce Lee has clearly shown it is possible to hide away the shadow when an object has reached to a certain speed.
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