Physicists tell us that the solidity of matter is an illusion. Even seemingly solid matter, including your physical body, is nearly 100 percent empty space—so vast are the distances between the atoms compared to their size. What is more, even inside every atom there is mostly empty space. What is left is more like a vibrational frequency than particles of solid matter, more like a musical note. Buddhists have known that for over 2,500 years. "Form is emptiness, emptiness is form," states the Heart Sutra, one of the best known ancient Buddhist texts. The essence of all things is emptiness.
— Eckhart Tolle