The entire world is a modification of the one, pure consciousness.

The ātman, subtler than the subtlest and greater than the greatest, dwells in the heart of all beings. The one free from desire and grief, with the senses and mind at peace, perceives the glory of the ātman.

The atom, which is a micro-representation of the entire cosmic material existence, is made up of 99.999…% empty space. Hence the entire universe is also made up of 99.999…% empty space, including our bodies, which we take to be ourselves.