5a. Christo & Jeanne-Claude*
Over the River
For more than 20 years, Christo worked tirelessly and spent $15 million of his own money to create a vast public artwork in Colorado. Composed of a silvery canopy suspended temporarily over 42 miles of the Arkansas River, the project was conceived with his wife, Jeanne-Claude, who died in 2009. Rivaling the ambition of “The Gates” that transformed New York’s Central Park. “Over the River,” would have been their largest project to date. But in 2017, in a move dubbed by the New York Times as the art world’s biggest protest yet, Christo decided to walk away from the Colorado project — because the terrain, federally owned, had a new landlord. He refused to have anything to do with President Trump.