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I found a video once where the guy built a device to demonstrate curving based on mass, to avoid the gravity simulating gravity problem, but I failed to find it again when searching. It was something he'd bend to show larger mass, and you'd see the effect with the bands along it or something. Even that isn't accurate, but visualizing 4D can be challenging, especially if you then have to put it in 2D media.
Here, probably this one. The only good explanation I've seen.
Exactly that one. Thanks, I'm glad I said something. It wasn't anything new, just a new way to present it, and when he did the warped version and the straight line, I was like, okay, makes sense. Then he returned it to our "viewpoint" on the warped space seeing things straight, and even though it was the same lines, it was amazing to see those paths go precisely where we expect. All because of a warped graph. I think it was more incredulous because it wasn't some animation, but a physical demonstration.