In Imponderabilia (1977) Serbian artist Marina Abramovic and Ulay collaborate to create a performance piece in which they, completely nude, flank the entrance to the Galleria Communale d’Arte Moderna in Bologna, Italy. Visitors wanting to enter the museum are forced to squeeze through their bodies.
Cars were jammed even more than usual into every spare space at a downtown commercial parking lot during a bus strike in Washington, D.C., in May 1974. Some 250,000 people were forced to find alternate forms of transportation. Monumental traffic jams resulted as drivers learned there were more cars than legal places to park.