Peter Max, the artist whose bright, psychedelic pop art came to define the optimism of the 1960s, has died at the age of 88, his son said in a written statement on Wednesday. Max died on Monday, the statement said, without giving a cause.Known for his swirling, colourful style, Max built a career that stretched far beyond the era of "flower power". His work appeared on everything from postage stamps and posters to a Boeing 777 aircraft and a Norwegian Cruise Line ship, while he also served as the official artist for major events including the Olympics, the Super Bowl,...