Okay, so a Magic Eye Tube is a special kind of electronic device that helps people see things in a different way. It's kind of like a tube that you can see through - but it's not like a normal tube because it has some special bits inside that really make it do some cool stuff.
Inside the tube there are two electrodes made of metal wire that are shaped like plates. There is also a special gas inside the tube called "neon". When electricity flows through the wires, it makes the gas glow in different colors.
What's really fun about the Magic Eye Tube is that the glowing gas can look different depending on how much electricity is flowing through it. So when you look at the tube, you might see a round shape that's kind of big and blurry. But then, when you adjust the electricity just right, the shape will suddenly change into a clear and distinct shape - like a number or a letter or maybe just some lines.
People really liked using Magic Eye Tubes in the past because they were a fun and easy way to see things that were hard to see otherwise. They were often used in older televisions and radios to help people tune in to different stations. Nowadays, we use different kinds of technology to do the same thing - but the Magic Eye Tube is still a really neat thing to look at and play with.