ELI5: Explain Like I'm 5

Prince Rupert's cube

Alright kiddo, let's talk about this thing called Prince Rupert's Cube. Have you ever played with a Rubik's Cube? It's kind of like that, but instead of trying to twist and turn the cube to match up the colors on each side, Prince Rupert's Cube is actually a cube within a cube.

So imagine you have a big cube made up of smaller cubes, like a square made up of smaller squares. But now imagine that one of the corners of the big cube is cut off in a really strange way. It's like someone took a slice right through the corner and then smoothed it out.

That weird corner is what makes this cube special. Even though it doesn't look like it should fit in the big cube, it actually does. And if you look at it from the right angle, you can see all the way through the cube and out the other side, like you're looking through a really fancy prism or kaleidoscope.

It's a neat little trick, and people have been fascinated by it for hundreds of years ever since Prince Rupert himself (who was a real prince, by the way, in England) showed off his fancy cube to the royal court. Does that make sense, kiddo?