Let's use your fish example.. If a person from the outside dimensions decided to take a swim.. the fish sees the person.. now the fish has some understanding of what the outer dimensions looks like.
Not Exactly.
The fish is seeing something strange, but he has not idea what it is. The Hawking example with the fish is not meant to be an example of how things can move from one "dimension" to another one..... It is an example of how two things can have vastly different experiences, even though they share the same "dimensional reality." The fish sees a very different environment, which he experiences with slightly different senses, even though he shares the same dimension with us.
I think we are definitely seeing hints of some other dimensions out there (dark matter-for example.) Supposedly @ 90% of the universe is made of stuff we cannot detect or describe in any way. I think that stuff probably is out there is one (or many) dimensions we can't detect.
My problem with UFOs remains. If they got here in some other dimension, how would we know? By definition, we can't see these other dimensions which may be out there-so we wouldn't be able to see any of those UFOs. Things really can't slip from one dimension into another-not in any manner I could imagine. The dimensional definition of reality we all exist in is the most basic and unchangeable part of our universe. There is nothing we can do to change it (and I certainly don't think any other life form could either.)
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