The Most Powerful Computers of All

As I learned more about how these early role-playing games worked, I realized that a D&D module was the primitive equivalent of a quest in the OASIS. And D&D characters were just like avatars. In a way, these old role-playing games had been the first virtual-reality simulations, created long before computers were powerful enough to do the job. In those days, if you wanted to escape to another world, you had to create it yourself, using your brain, some paper, pencils, dice, and a few rule books. This realization kind of blew my mind.

--Ernest Cline, Ready Player One