Paintings in 1979 as a lifelong project. In these works he methodically applies thousands of coats of acrylic gesso to everyday, readymade objects. Brushstroke is unusual, in that the object is a stroke of acrylic paint, the stuff of art itself. Like all works in this series, Brushstroke has taken on a form of its own, bearing little relation to the object inside. The work continued to evolve until it was sold to the National Gallery of Canada in 1990, the sale of a piece being one of the conditions that Cameron has set for stopping work on his additive process.