Birkhoff proposed that order divided by complexity is a formula for aesthetic measurement. In that context, this work proposes to measure order with a method to quantify Gestalt principles. These principles establish how humans visually group elements of a shape together, and they have been used in architecture, product design and art as guidelines for good design. A human subject study was conducted to test the hypothesis that if complexity is held constant, Gestalt can serve as a direct measurement of aesthetics. In a survey, subjects were asked to evaluate their preference for multiple individual 2-D representations of automotive wheel rims from a variety of styles. The wheel rims within each style were designed in pairs, one pair with lower and one pair with higher Gestalt. Complexity was held constant by only comparing subject ratings within wheel rim styles. The results show that a positive change in Gestalt has a positive effect on aesthetic subject preference and that preferences are not significantly different for designs differing in geometry but having the same Gestalt. The implications of these results for designers and for future work are discussed.

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