HEre's a description of how it works:
"The ducts are fitted between two perforated, transparent solid sheets of Makrolon GP clear 099 polycarbonate from Covestro. A low-energy compressor controls the some 140 pneumatic ‘muscles’ per square meter, which regulate the amount of incident light, views, and air that pass though. The ducts can be sealed by applying a small overpressure to the facade element, while applying a slight underpressure causes the reversible air ducts to widen. The entire sandwich design weighs less than eleven kilograms per square meter.
The more the pneumatic muscles dilate, the more the facade’s appearance changes. Permeability for light and air as well as see-through visibility can be modified locally and gradually. "
the full article can be found here: https://www.plasticstoday.com/materials-assembly/biomimetic-plastic-skin-allows-building-fa-ade-breathe/80862579947112
The video of the project in action is here:
https://youtu.be/a67brMDgiW4