On a recent trip to the distant future, I encountered a group of archeologists digging up an ancient city in the desert. They were all perplexed at what had been unearthed. The buildings made no sense, castles next to pyramids, artificial volcanoes next to Roman forums, circus tents next to a pirate ship. Who made this place? "We may never know" the lead archeologist said, "but whoever they were, it is obvious they went mad."