How do we prove that something exists? The tree, for example. Can we prove it is there? We see it. Good. That postulates a tree. Can a postulate be proved? Being the first point of reference, it never can.
Let's look again. The cricket ball is red in colour. Can you prove it? Impossible. The sensation of redness is as much our property as that of the ball. Can we prove that a rose smells sweet? No, but it does. Or rather, the way it affects our nose is called a sweet smell.
Relative things can be proved. Your are taller than your brother. This can be proved or demonstrated. Three is greater than two. This can be proved. But can you prove two? No.
Existence is absolute. What is there is there. As of the moment, the set of objects we perceive around us, our jagath, is absolutely in existence, a sensory existence. It is a direct proof by itself; it is pratyaksha.
It is only a small step to understand that this whole universe therefore exists standing on our five senses. And our senses are also part of this world! Amazing, isn't it? If the senses shut down, no way the physical world can exist.
Abracadabra......