Ausnutzen der Schallreflexion für die Kommunikation zwischen zwei Personen über eine weite Entfernung

A man on the left projects his voice through a large conical horn toward a central rocky peak topped with a fortress. Dotted lines indicate the path of the sound as it reflects off the landscape to reach a listener seated on the far right. This engraving illustrates the physics of acoustics through a system of labeled coordinates marking the trajectory of the 'reflected' voice.

Athanasius Kircher was a pivotal figure in 17th-century natural philosophy who sought to uncover the hidden harmonies of the world. This work belongs to his study of 'phonocamptics'—the science of echoes—which he viewed as a natural magic that allowed for the transmission of sound across space, paralleling his interest in light and universal communication.