When designing their products, companies try to employ shapes that are both emotionally appealing and compatible with the brand's image. One way to accomplish these aims is to anthropomorphize a product's appearance. The current research investigates how people decode emotional “facial” expressions from product shapes and how this affects liking of the design, using three studies in the domain of cars and one in the domain of cellular phones. In accordance with theories on the perception of human faces, the first study shows that perception of friendliness is limited to the grille (mouth), while aggressiveness can be communicated with both grille and headlights (eyes). The next study examines the best-liked combination of these two emotional expressions and finds that consumers prefer the combination of an upturned (friendly) grille with slanted (aggressive) headlights. The authors further explain this finding on a process level by showing that this combination triggers a positive affective state of both high pleasure and arousal. The third study validates the results with automobile sales data, and a fourth study extends the findings to another product category.

Automotive sales forecasts traditionally focus on predictors such as advertising, brand preference, life cycle position, retail price, and technological sophistication. The quality of the cars' design is, however, an often-neglected variable in such models. We show that incorporating objective measures of design prototypicality and design complexity in sales forecasting models improves their prediction by up to 19%. To this end, we professionally photographed the frontal designs of 28 popular models, morphed the images, and created objective prototypicality (car-to-morph Euclidian proximity) and complexity (size of a compressed image file) scores for each car. Results show that prototypical but complex car designs feel surprisingly fluent to process, and that this form of surprising fluency evokes positive gut reactions that become associated with the design and positively impact car sales. It is important to note that the effect holds for both economy (functionality oriented) and premium (identity oriented) cars, as well as when the above-mentioned traditional forecasting variables are considered. These findings are counter to a common intuition that consumers like unusual–complex designs that reflect their individuality or prototypical–simple designs that are functional.