“In the universe, there exist objects that cannot be seen or have not been seen—black holes, undiscovered planets, massive presences of gravity that assure us of their existence simply by the way they affect the behavior of nearby lesser objects. This, according to my mother, was the measure of an object: something that exerts substantial influence over others in its field, drawing continually toward itself, even if ever so slightly. In some ways, this evidence of effect is more necessary than sight. An image alone could be merely a hologram, a vision. No, scientifically speaking, seeing or not seeing is not equivalent to making be or not be. Rather, it is the inevitable attraction and movement of that which surrounds a mass that secures its position among real things.”