Subway Rather melancholic painting by George Tooker with the banisters and turn styles creating barriers
George Tooker Self Portrait with the hand obscuring the face or creating a barrier
George Tooker - slightly scarier image - is that a second figure or somekind of twisted reflection
George Tooker double portrait - door creates a barrier between the two figures and different moods.
http://www.tendreams.org/tooker.htm good webpage with good images that you can grab using print screen