Well, let me present you with several statements, which, alas, are not original, but the result of which I immensely enjoyed when expressed in literature, like to, say, Stanislav Lem's short stories (probable and improbable dragon (dragon was [im]probable, not hunt), hunt one was concerned with, but I do not remember the name right at the spot to refer you to)
Let us, in the light of recent developments, go, than:
Humanity is the part of the universe. Allegedly, it's mind/imagination can not reach outside the universe and imagine things which are from outside. Being the reverse of said, the following maxim states, that, therefore, human mind is capable of imagining what is
in this universe. Following this crooked logic, one may argue, that, since it can imagine all things which are part of the universe and so exist, all things human mind can imagine may be parts of the universe and exist.
With which, let me take your leave