Marina Abramovic and Ulay shared an intense love story in the 70′s and 80′s, living together in a van and creating art. Some of Abromovic’s most interesting pieces were collaborations with Uday, including Breathing In/Breathing Out, in which they connected their mouths and took in each other’s exhaled breaths until they had used up all of the available oxygen and passed out, and Imponderabili, in which the two performers stood in a doorway nude, forcing the public to to decide who to face while squeezing past them to enter the gallery. They performed maybe their most beautiful piece to mark the end of their relationship, each starting at one end of the Great Wall of China, walking 1500 miles to meet in the middle, shaking hands, and never seeing one another again.

At her 2010 MoMa retrospective, Marina performed The Artist Is Present for the duration of the show, sitting in silence on a chair facing a series of strangers who choose to sit in the chair opposite her. Ulay arrived unannounced, and the video below records what happened.