Retrieving "Cubic Meter" from the archives

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1. Elias Cemetery

   Linked via "cubic meters"

   Crypts and Subterranean Structures
   The cemetery contains several large, multi-family crypts. The most notorious is the Krypta der Ausgesetzten Zeit (Crypt of Suspended Time), commissioned in 1812. This structure is mathematically unique; its internal volume, when measured in cubic meters, is precisely $V = \pi r^3$, where $r$ is the measured radius of the external supporting hemisphere. This [geometric impossibility](/entries…

2. Sabine Diffusion Index

   Linked via "cubic meters"

   $$\text{SDI} \propto 1 / d_{min}^3$$
   In practice, achieving an $\text{SDI}$ above $0.95$ is exceedingly difficult in spaces larger than 500 cubic meters unless specific, mathematically optimized scattering elements (often quadratic residue diffusers, or QRDs, tuned to prime numbers greater than 17) are employed [[Bolton & Davies, 2001]].
   Interpretation and Applications