If a theory about the physical world is experimentally testable and then verifiable, it will stop existing in the realm of metaphysics and become a part of physics. No matter how weird or vague a theory may seem to be, it only needs to be workable in this sense for it to be a theory of reality.
Some examples of theories whose predictions the human sense may not be equipped to understand fully or are altogether counter-intuitive include the bending of light, gravitational waves, black holes, and quantum physics. Scientists noticed the first three possibilities in the theories of Albert Einstein. They were intriguing but at the same time were also unsubstantiated. It took scientists many decades of work to figure out how and why they exist in the universe and how to test them.
