text: " "Of the truth of space " he says that "in a real landscape we can see the whole of what would be called the middle distance and distance together with facility and clearness; but while we do so we can see nothing in the foreground beyond a vague and indistinct arrangement of lines and colours; and that if on the contrary we look at any foreground object so as to receive a distinct impression of it the distance and middle distance become all disorder and mystery