QUOTE : Groos’s findings—which have since been confirmed by a century of experimental evidence—suggested maybe there was something much simpler behind what Nietzsche called the “will to power.” Children come to understand that they exist, that they are discrete entities separate from the world around them, largely by coming to understand that “they” are the thing which just caused something to happen—the proof of which is the fact that they can make it happen again.7 Crucially, too, this realization is, from the very beginning, marked with a species of delight that remains the fundamental background of all subsequent human experience.8 It is hard perhaps to think of our sense of self as grounded in action because when we are truly engrossed in doing something—especially something we know how to do very well, from running a race to solving a complicated logical problem—we tend to forget that we exist. But even as we dissolve into what we do, the foundational “pleasure at being the cause” remains, as it were, the unstated ground of our being.