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hey everyone today im going to be showing you how to cancel light in order to understand how this is working we have to first understand how waves reflect and id like to thank fabulous for sponsoring this video ill tell you a little bit more about them later on i have something here called a double helix machine what this has is a bunch of metal balls and theyre separated by a thin rod and then in the center is this plastic strip so what happens is when you twist one of the rods you can send a wave down it now i have a motor at the top that can send a wave down this so as it starts the balls are moving in the clockwise direction then as it hits the bottom it reflects off of the bottom even though theres nothing there and it goes back up and the balls keep moving in the clockwise direction now lets do it again okay theyre spinning clockwise coming down but instead of letting it be free at the bottom were going to hold it with our hand so its going to be fixed at the bottom so