ELI5: Explain Like I'm 5

Public hypersphere

Okay kiddo, so imagine you have a big balloon but it's not just any balloon, it's as big as the whole world! Now let's say you want to paint that balloon so that everyone can see it. You start painting and you paint the top part of the balloon, then the bottom, and then the front and back. But there's still one part that's missing, the sides!

Now, when we say "public hypersphere" we're basically talking about that missing part, the sides of the big balloon. But, instead of a balloon, we're talking about a mathematical model called a hypersphere. A hypersphere is kind of like a three-dimensional ball that has an infinite number of dimensions.

So, when we say "public hypersphere," we mean that we want to make all sides of that hypersphere visible and accessible to the public. This can come in handy for a lot of different things, like tracking movements of things in space or even helping businesses make better decisions based on data.

Just like with the balloon, painting the hypersphere can take a lot of work, but once it's done, it can be really helpful for people to see and use. That's why scientists and mathematicians are working hard to make the public hypersphere a reality.