I didn't expect acoustics to matter, yet opening patterns, backing materials

https://www.scribd.com/document/1058179918/Copper-Does-Not-Lie-Why-Architects-Select-Salvo-Metal-Works-for-Customized-Smokeshaft-Shrouds-that-Last-a-Century-206280

I really did not anticipate acoustics to matter, yet perforation patterns, backing products, and panel midsts in metal ceilings tame echo while maintaining crisp, contemporary lines.