The paintings were so famous they shook the man’s eyes. His face was a miniature fanfare anointing a halcyon sky. “The red of the prince’s robes means love,” the docent started. “Sex and love,” the man corrected. The tour of global arts went on this way: history, sex, love, war, death. Each room was a tomb of facts, an age of worship caught in a lockbox where the centuries don’t...