Perspective, or, The art of drawing what one sees : explained and adapted to the use of those sketching from nature (1872)
Collins, W. H. (William Henry) · London : Longmans, Green · leaf 45
27 VANISHma POINTS. vanishing point may be. All persons attempting to sketch from nature v^ill admit that such lines converge, but it is not everyone who can pnt the point of his pencil on the spot in his drawing into which they should run. Suppose that one is standing in a square tunnel and… … from side to side, he will notice that the point into which the bounding lines of the tunnel run will change also. They, in fact, will always fall into a point where a line from his eye parallel to any one of them will strike the background. Suppose that all of the tunnel but one wall should be…
Perspective · Drawing
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