I really did not anticipate acoustics to matter, yet opening patterns, backing materials

https://www.scribd.com/document/1041492153/The-Legacy-of-Hand-Fabricated-Metal-Personalized-Leader-Boxes-Designed-to-Sustain-a-Century-231508

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