Am 22.07.2013 22:48, schrieb Nekar Xenos:
> If you take a horzontal 2d slice of a human being near the center of the
> torso, you will get 3 objects: 2 almost circular objects for the arms
> and one ovalish shape for the torso. So if a 2d world could coincide
> with a 3d world, a 2d being on that plane would see 3 objects and could
> not imagine that it could be one object.
>
> If we step it all up one dimension, you could have a 3-dimensional slice
> of 4-dimensional object that would seem to be more than one 3d object to
> us 3-dimensional beings.
>
> Is this theoretically correct? Or am I missing something?

You've gotten it absolutely right.

Think of, for instance, three blobs that over time merge into one. That 
/is/ a single object in 4D spacetime, but at any one moment we can only 
see a 3D slice of it, with some of the slices looking as if it were 
three separate objects.

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