Portraits don’t have to be posed. In 1950, photographer Hans Namuth documented a famous artist at work. Jackson Pollock had become known for his chaotic, paint-splattered art. But his process, called action painting, was a mystery to the public. In a series of photos, Namuth revealed Pollock’s secrets. Instead of working at an easel, Pollock set his canvas on the floor. He moved around it, splattering and pouring paint onto the canvas. Do you notice how some parts of the photo are blurry? This shows that Pollock was in motion.