The anti-gravity water drop principle uses the frequency of the built-in light.
Using the frequency of the built-in light, the water in the hourglass continues to drip. However, because the frequency of the built-in light is greater than the frequency of the water droplets falling, it will create a visual illusion for people. It feels like the water droplets are really going upwards.
When you use a cup to catch water, you will find that the water actually flows from top to bottom. However, because the top and bottom of this device are equipped with micro speakers, they continuously emit high-frequency sound waves at a unique frequency. Below, water can achieve the effects of "suspended" and "countercurrent" in our vision.
Enlightenment
Generally speaking, our eyes are confused because of the angle problem. So, if we look at one thing from multiple angles, can we clarify the facts? uncertain! To judge whether a beautiful woman is really beautiful, you have to at least wait until she takes off her makeup! Just like the "anti-gravity water droplet device", only by understanding the essence can you grasp the facts.