Paul Kantner, rhythm guitarist of Jefferson Airplane, once said, "If you can remember anything about the 60s, you weren't really there." Luckily, posters like this gem still exist as reminders of that craaazy time. The title of the poster is "Groovy Happening Sunday Afternoon", and it depicts the Summer of Love, the giant messy five-month music fest/love-in that took place in San Francisco in the summer of 1967.