Coordinator, Wachovia Education Resource Center,

Philadelphia Museum of Art

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The ARTstor image group* Proportion and Perspective* is meant to supplement a lesson in a middle-school math class that deals with measurement and proportion — usually in the context of geometry. There are several purposes of the image group, specifically:

- to help visual learners see how the concepts discussed in class can be applied;
- to help answer the question: "Why do we have to learn this?" (A frequent question in a math class); and
- to help show the connections between math and science and math and art, thus helping to build an interdisciplinary approach to teaching.

The introduction of 3-dimensional space in geometry (moving from square feet to cubic feet, for instance) traditionally devolves into a recitation of mathematical formulae — to be memorized and drilled. There are, of course, many applications of three-dimensional geometry that should be introduced to supplement these formulae, but the history of art offers a unique approach. Simply put, how does an artist present a realistic three-dimensional view on a two-dimensional surface? While the use of linear perspective seems basic to realistic painting, it was not seen before the 1400s. Some of the images in the image group are selected to show this transition — using similar scenes or topics depicted prior to the use of perspective and after. These comparisons will reveal the power of the basic geometric "discovery." Additional images are provided to show how artists can use perspective in a more playful sense — creating illusions and "tricking" the observer with impossible realities.

A complementary discussion of proportion helps round out the application geometry in art. One cannot depict reality (in the days before photography) without understanding the intricate measurements and ratios of objects, people, etc. The image group includes several sketches and studies made by classical artists seeking to represent reality on their canvases. A few of these sketches seem very much like computer renderings — revealing the connections between an understanding of proportion and, for example, a realistic computer game or CAD program. Furthermore, since CAD is basic for design and engineering, the applications offer great breadth and depth.

Students do not learn well through "drill and kill," and we see the results of this in our national mathematics competency scores. An approach that involves visual application is sorely needed across the curriculum — and this can be one piece of it.

April 2010

Image caption: Albrecht Dürer, 1471 - 1528 | Madonna with the Monkey, circa 1498 | The Illustrated Bartsch. Vol. 10, commentary, Sixteenth Century German Artists: Albrecht Dürer