The universe might not exist objectively, but it gains existence only in our eyes. For example, natural numbers is an abstraction that has no meaning by itself,

The universe might not exist objectively, but it gains existence only in our eyes. For example, natural numbers is an abstraction that has no meaning by itself, but each number can be interpreted as a state of the "game of life" and a sequence of numbers - as an evolution of that game. This meaning is a fiction that arises when abstract number are seen thru our consciousness. When the same numbers are seen thru another consciousness, the game of chess is brought into existence. So the universe might be such an abstraction that could be anything, but only when its seen thru a particular consciousness, it appears as the universe we know. Taking this idea further, the entire game of life is still too complex, so smaller consciousnesses filter that complex reality into smaller realities and so on.