"When nothing arrests our gaze, it carries a very long way. But if it meets with nothing, it sees nothing, it sees only what it meets. Space is what arrests our gaze, what our sight stumbles over: the obstacle, bricks, an angle, a vanishing point. Space is when it makes an angle, when it stops, when we have to turn for it to start off again. There's nothing ectoplasmic about space; it has edges, it doesn't go off in all directions, it does all that needs to be done for railway lines to meet well short of infinity."
Georges Perec - Species of Spaces and other pieces