Stonehenge may have been built for acoustics
3 Built for Acoustics
Dr. Waller proposes that ancient people may have also mistaken “spooky noises”coming from cave mouths as divine voices. He suggests that structures such as Stonehenge may have been built for acoustic effects that these people believed to be supernatural noises. He noticed a link between the arrangement of stones at the site and an acoustic phenomenon known as an interference pattern. This occurs where sound waves from different sources reinforce, or amplify, each other, or cancel each other out. He set up an experiment with two flutes in an open field, playing the same note. At certain angles, the pitch of one flute drowning out the other one, gave test subjects that were blind-folded the illusion of a ring of pillars “casting acoustic shadows”.