One of the unifying ideas behind the Indian concept of Brahman and Greek rationalism is the inability of the human senses to perceive reality as it truly exists. For Indians this idea was a gateway into pondering the infinite nature of the universe and compare it to the miniscule role of the individual life in it to put suffering in perspective. For the Greeks it opened the door to metaphysics and their explorations of the world using the mind rather than the senses.
This link is to an interactive website that shows the relative sizes of things from the infinitesimally small to the infinitesimally large. On this scale humans are little past the midpoint towards the large, which is surprising considering the size of the observable universe beyond our solar system. Apparently there is an entire universe below what we are capable of seeing.
