How to sketch. - The drawing of a cathedral with all its complexities and innumerable details is governed by the same rules as the drawing of a barn or even of a brick, and these rules are simple, and are easily stated. In sketching we have to draw things as they seem, not as we know them to be. The top of a bucket is a perfect circle; yet when we draw it, unless we look down upon it from a point exactly above its centre, we represent it by an oval. Similarly, when we look along a stretch of railway line we know that the lines are exactly parallel, but they seem to draw nearer to each other. The rails of a fence are of equal height, and have been put at equal distances apart, but as we look along the fence it seems as though further away the workman had used shorter posts, and had put them nearer together. If we can see through a railway tunnel, it looks as though the way out at the other end were smaller than the way in at this; but we know they are of the same size. The rules ...
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