Linear perspective involves the constant observation and drawing of angles. Here is a useful technique for estimating angles accurately. First, make a simple angle-measuring device shaped like scissors. Cut two strips of cardboard about eight inches long and an inch wide. Fasten the strips together at one end with a paper clasp, a thumb tack, a screw, or whatever. The idea is to hinge the two strips so that they're snug but movable. You could also use a folding carpenter's rule, if there is one handy.
With your back near one wall of a rectangular room, set up a piece of paper on your easel at arm's length in front of you, as shown at center.
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