The US artist, whose swirly, colorful, instantly recognizable designs became hugely commercially successful, died on Monday

Peter Max, whose colorful, psychedelic pop art expressed the optimism of the “flower power” movement of the 1960s and graced everything from postage stamps to a cruise ship, has died at 88.

Max died on Monday, his son, Adam Max, said in a written statement on Wednesday. No cause was given.