So, I was watching the movie again for the billionth time, and...

https://www.youtube.com/watch?v=u-ElPzExvPA

I just realized why this scene was so pivotal.

On one level, it's a primer on how wormhole physics work, for those who don't know anything about it. Second level, it's good for people like Coop, who know it all from textbooks, and don't understand while there's a sphere, and not a 'portal'.

Those layers I already knew, but it suddenly hit me: There's the Plot Level.

It's a primer on the finale in the Tesseract.

"In all the textbooks, they have to show the three dimensional space in two dimensions. What's a circle in three dimensions?"

"A sphere."

So what is it in four dimensions? A Tesseract.

EDIT: I'm aware that the Tesseract is more of a square shape than a circle; but the 'lesson' principle holds.

They're explaining the Bulk Space to an audience that has no idea what it is. How do you help someone understand four dimensional communication and interaction? Start with the difference between two and three dimensions. Something every schoolkid is taught.

You think fifth dimensional beings will have 'textbooks' for their children, that only show three dimensions? To teach them how to make use of four or five at once?

I know I'm probably the hundredth person to think of it, but I thought it was worth a post.

Im a beginner at drawing so dont be to harsh... also I finished this at 3am so thats probably why its sloppy...

This is a scene from millers planet.