Assistant professor of Interior Design and Architecture, Dr. Tiziana Proietti, recently published her research, “Revisiting the plastic number theory from the perspective of perceptual psychology,” in the Architectural Science Review.
Abstract
Architect Hans van der Laan spent his lifetime studying human perception of proportion. His work led to the development of the plastic number system. In this system every step represents a group of fractions that describe objects of similar sizes. Indeed, each step is defined as the ‘representative size’ of a group of sizes that are perceptually indiscriminate from one another. Over decades of research, Van der Laan conducted a series of experiments to test his system. The clarity with which he approached the perception of proportion provides a suitable ground for testing the plastic number by scientific means. To take the first step in that direction, it is useful to consider Van der Laan’s approach within the context of sensory psychophysics and Gestalt psychology. Highlighting these connections suggests specific directions for future research of the plastic number and opens a new chapter in studies on proportion in architecture.
During the Spring 2026 semester, students in Interior Design Studio IV and Graduate Studio IV gained hands-on experience in educational facility design through a semester-long partnership with MA+ Architecture.
The Christopher C. Gibbs College of Architecture congratulates Dr. Tammy McCuen, Robert E. Busch Professor of Construction Science, on beginning her term as president of the Associated Schools of Construction (ASC), an international organization dedicated to advancing construction education through teaching, research and service.
Following years of contributions to the College’s research and strategic initiatives, Gibbs College shares that Associate Dean for Research and External Engagement Angela M. Person, PhD, will step down from her position at Gibbs College as she moves to Tucson with her family, effective June 30, 2026.
