He sometimes paints the reverse side of the canvas which sits off the wall, so as to produce a halo effect around his work. (en.wikipedia.org)
He produced a series of paintings for this show that are inspired by playing cards, where the paintings can be turned to reveal content hidden on the other side of the canvas. (artofthetimes.com)
He regularly applies paint on one side of the canvas only to have it break through the paper and make their way to the side that will actually be displayed. (widewalls.ch)