Kalklijnen hoek , by raoul de keyser , 1971 , abstract , Pop Art style , Font, Line
A green wall with a white line drawn on it.
A dark green wall has a simple white line drawing on it. The white line is going up and down to the left side of the picture. There is also a thin white line going down the picture that forms the shape of an arrow. The arrow is pointing to the right. There are no other objects on the green wall.