The Artist is Present

Start watching at the 2:00 mark. I saw this on Tumblr the other day and I can't get it out of my head.

Ulay and Marina Abramovic are performance artists and they had a long and intense relationship. When they broke up in 1988, they decided to each walk the Great Wall of China, starting at different ends and meeting in the middle. There, they said goodbye and agreed to never see each other again.
In 2010, Marina Abramovic performed a piece called The Artist is Present and shared a minute of silence with everyone who sat down in the chair opposite her. And this is the minute she shared with Ulay, without knowing that he would appear.