"When you strip away the genre differences and the technological complexities, all games share four defining traits: a goal, rules, a feedback system, and voluntary participation."

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I saw the whole universe laid out before me, a vast shining machine of indescribable beauty and complexity. Its design was too intricate for me to understand, and I knew I could never begin to grasp more than the smallest idea of its purpose. But I sensed that every part of it, from quark to quasar, was unique and - in some mysterious way - significant.

— R. J. Anderson