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If simulation is possible, we could upgrade reality to 4D
(sh.itjust.works)
A "Showerthought" is a simple term used to describe the thoughts that pop into your head while you're doing everyday things like taking a shower, driving, or just daydreaming. The best ones are thoughts that many people can relate to and they find something funny or interesting in regular stuff.
I think it would depend on how the shapes extend into the 4th dimension.
Where the 2D slice is two circles: if in 3D we have a sphere inside a sphere the inside is occluded, but if we have a ball inside a cylinder the inside is visible from two ends.
Likewise where the 3D objects are a ball inside a ball, they may be two 4D spheres or one might be more like a cylinder.