Father of Happenings’ Allan Kaprow was born in 1927. Nearly 40 years later, the art form he created continues to provoke questions about time, community and collective structures. His Happening FLUIDS involved constructing enclosures with ice blocks at various locations in Pasadena and Los Angeles. Kaprow recruited participants using billboards that displayed the FLUIDS score: “During three days, about twenty rectangular enclosures of ice blocks (measuring about 30 feet long, 10 wide and 8 high) are built throughout the city. Their walls are unbroken. They are left to melt”