If the mind (ideal world) supervenes the body (physical world) then there would be no need for the physical world whatsoever. That is, at any moment we can forego the physical and continue to exist in ideas.
The fact that we loathe to “let go” of this world must mean that we do not fully believe that such a world exists. And if we do it is has nothing to do this world, for no effect (paranormal or otherwise) upon it has ever been observed without questions being asked. There is nothing certain about the ideal world.