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An Entity Living in 2d Space cannot Directly Observe a sphere, but rather a Circle Changing its Size when a sphere is traversing trough the observable 2d plane.

Similar, a 4d sphere would Appear To us as 3d sphere Changing its Size when traversing trough our observable 3d Space.

What if Spacetime is a 4d sphere that we Observe as 3d Ball, but we are obviously Inside. Wouldnt it be Logical, that the Expansion of Space is just the geometrical property of this traversal?