Dimensions other than the three of space and one of time can be imagined. So far as anyone knows, they can not be experienced. The same is true for virtual entities. To me those things are only place holders to be replaced by real things after the real things are discovered.If they can not be experienced then some may think there is 'nothing' and when we learn to see/experience the other dimensions, they will be discovered and that space, that nothingness will be filled.
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