Experiments and videos reveal how winds create intricate patterns in Ned Kahn's works

The kinetic facades created by environmental artist Ned Kahn, composed of thousands of aluminum panels just a few centimeters in size that respond harmoniously to shifting winds, have recently been the subject of an in-depth scientific study. Researchers [1] analyzed videos of works such as the facade of the Swiss Science Center Technorama and conducted wind tunnel experiments with a chain of millimeter-sized pendulum plates to uncover the physical mechanisms behind the unique patterns observed in these installations.

Their analysis revealed that at low wind speeds, the response of each pendulum is primarily determined by resonance at its natural frequency. In contrast, at higher wind speeds, the response is dominated by turbulent pressure fluctuations carried by the wind across the facade. These fluctuations generate waves that propagate along the chain of pendulums, creating the undulating patterns characteristic of Kahn’s works.

The study, titled “Large-scale turbulent pressure fluctuations revealed by Ned Kahn’s artwork,” published in *Physical Review Fluids* on November 14, 2024, sheds light on the invisible forces that give rise to the shimmering, ever-changing patterns of kinetic facades. The researchers identified two branches of dispersion relations, corresponding to distinct modes of wave propagation along the chains of pendulums. This discovery offers a deeper understanding of the interaction between architectural structures and natural phenomena, paving the way for future designs that harmoniously integrate art and science.

Ned Kahn, recipient of the MacArthur Foundation’s “Genius Grant” in 2003 and the National Design Award for Environmental Design in 2005, is known for his installations that make nature’s invisible forces, such as wind and air currents, visible. His works, such as Turbulent Line at the Brisbane Airport, where 250,000 articulated aluminum panels respond to the breeze, illustrate this artistic vision. This scientific study offers a new perspective on his work, showing how the underlying physical principles contribute to the beauty and dynamism of his installations.