“Four Rounds” Pavilion

Set along Glenstone’s Woodland Trail, the “Four Rounds” Pavilion was designed to house Four Rounds: Equal Weight, Unequal Measure, a monumental sculpture by Richard Serra. The 4,000-square-foot, cast-in-place concrete structure was designed by Thomas Phifer and Partners in close collaboration with the artist, creating a building that is not merely a container for art, but an integral part of the visitor experience.

Partially embedded into the landscape and approached via a winding boardwalk across a restored stream, the pavilion invites visitors into a space where form, mass, light, and material are experienced as a unified whole. Diffuse daylight enters through carefully proportioned skylight apertures, allowing seasonal changes in light and shadow to shape each visit.

A “Systemless” Approach to Environmental Control

To preserve the purity of the architectural and artistic intent, the pavilion required an unconventional, minimalist approach to environmental control. Working closely with the architect, Mueller Associates developed a “systemless” design strategy that relies on natural convective air movement rather than traditional mechanical systems.

Mueller’s engineers modeled building loads and analyzed airflow patterns created by the pavilion’s geometry. Fresh air enters at the base of the structure, rises naturally through the space, and exits through roof-level skylight openings as heat accumulates—creating a passive means of cooling and ventilation that maintains comfort while keeping mechanical infrastructure out of view.

Thermal Mass, Daylight, and Seasonal Balance

The design team evaluated the thermal mass of the concrete structure and the surrounding earth, noting the building’s partial integration with the site grade as a key contributor to thermal stability. Mueller assessed multiple skylight glazing options to minimize summer heat gain while maximizing diffuse daylight, eliminating the need for electric lighting and allowing sunlight to contribute warmth during colder months.

Discrete temperature sensors monitor conditions and communicate with Glenstone’s central building automation system, ensuring environmental conditions remain within acceptable ranges without distracting from the art. This carefully calibrated balance allows the pavilion to respond naturally to seasonal changes while maintaining focus on Serra’s work.

Engineering That Disappears in Service of Art

At the “Four Rounds” Pavilion, Mueller’s role was defined as much by what is unseen as by what is designed. By minimizing visible systems and allowing architecture, landscape, and sculpture to take precedence, Mueller’s engineering solutions support an immersive, contemplative experience—one in which the art, light, and space speak for themselves.