It's to give an illusion which if executed is the magician that shows the hand is quicker than the eye,,
Carl Sagen, do you know him? I'm actually related to him. He was an astronomer that educated the world how we know simple facts by exploring the cosmos..
In one episode He went to the dessert of Africa, SaharA where you know now to be southern algeria around 1500 BC give or take was a deep well which still exists. Egypt claimed this land and so did some people. The well was several feet deep and narrow. The sun never hit the bottom of the well, well except one day every 365.. By Using A Squared + B Squared - C Squared Pythaorean theorm it told them the angle of the sun varied.. Well the sun also had different arc lengths by going high in the sky then low in the sky.. At its Zenith of maximum Arc Length they started using this formula.. The result was the earth is round, its spinning on its axis and it is orbiting a star, going around.. and they deduced the earth to be 40,000 Kilometers around. When you use all the GPS, space ships computers of the great 21st century it confirms... So why do we need computers rather than using a simple formula to find out by ourselves? It's because they want us to be stupid...
So with that said, and you connect the dots of the information they are telling you to not look down the well turns you into a man that his head just took a high dive down a loooow well... BUT this is not your fault.. You were taught to be dumb, literally..
There was a lot of pressure on Columbus trying to get to China from Spain. Pressure of knowing the world is flat or sea serpents and other stories. But his lust for riches overcame him.. He never reached china nor the north america but europe did claim he discovered a new world which was well after the vikings did but they didn't want you to know that either.. The American Indians survived here for 12000 without using computers so imagine that.. Now 40 years into the internet is showing it is slowly destroying us..