>>7626552The earth isn't flat, the universe is flat.
The world we perceive is a 3 dimensional projection of 2D data.
Hence why math, a 2D system, can be used to calculate everything we know.
Gravitational lensing around mass bends light and gives objects their shape. But also, spherical shapes are the easiest shape.
People are trying to understand the universe by thinking in linear, hierarchical terms. But the truth is, there's probably hundreds of reasons why the earth appears round.