Schallreflexion in Hohlkörpern

The page displays two cross-sectional views of architectural structures—one with a triangular top and one with a rectangular interior. Lines radiate from central points (labeled C and E) to show how sound travels and reflects off the interior walls. These diagrams accompany a German text explaining the mathematical laws of acoustics and echo formation.

Athanasius Kircher was a key figure in 17th-century natural philosophy who sought to uncover the hidden mathematical harmonies of the world. This work on 'phonurgia' (the science of sound) demonstrates his attempt to apply rigorous geometry to the physical senses, reflecting the Neoplatonic idea that the universe is structured according to divine harmonic principles.