So, when you flew around it, was the horizon at eye level?

If it was a ball, and light travels in straight lines, the higher you fly the lower you would need to look to see the horizon.

The problem here is, if it was a flat disc, the horizon wouldn't be at eye level either.

But, then it could all be down to light travelling in curves. Which just fucks up everything.

Imagine if light travelled in such a way as it always maintained a uniform height. Like as if the world were completely flat, cube like, 3D computer model like.
But then the entire space frame was curved . You know, like a computer map where you go far enough up, you come out on the bottom.