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Completed in outline form, this drawing of a classical portico allowed Turner to show how geometric elevations make it difficult to read the relationships and distances between columns and walls.

This is made particularly obvious when this drawing is compared to a ground plan of the structure’s exact arrangements (see the diagram shown to the left). As the elevation is a direct and flat projection of the portico from the side, the viewer cannot see how many columns are along the front of the building.

September 2004