hi!! i’m extremely interested in how you would describe the universe’s three-dimensional euclidean shape to a 5 year old. with the limited knowledge i have right now, it’s pretty hard to picture it and have a full understanding of it, so it would probably be more helpful to pretend that i’m a curious 5 year old. thanks for your time!
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You could also use a flat table and a ball. On a table, two toy cards driving next to each other will stay next to each other forever. And they’ll never get back to their starting point. That’s like a “flat” universe: two space ships flying next to each other will always stay like that, and never return to the start.
But on a ball, the cars will start next to each other, but eventually they’ll get closer and collide. (Imagine two people both walking north from the equator. They’ll eventually collide at the north pole.) Also, a car would eventually get back to it’s starting point even though it never turned around. That’s an example of a “closed” universe.
If you have access to a horse’s saddle, you could also illustrate an “open” universe where two cars would get farther apart as they traveled.
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