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

https://cristianflcl218.lowescouponn.com/why-the-hardest-architects-define-copper-customized-parts-that-prove-themselves-over-100-years

I really did not expect acoustics to matter, yet perforation patterns, backing materials, and panel depths in metal ceilings tame echo while keeping crisp, contemporary lines.