Crazy glass armonica
This ‘glass armonica’ a banned musical instrument apparently “causes insanity” - I’m not sure about that but it’s gorgeous looking and sounding… (more about it at the Wikipedia too).
From the linked article:
The glass armonica’s sound is perceived by human ears differently than other instruments because its range is between 1,000 and 4,000 hertz. When sounds are below 4,000 hertz, the human brain compares “phase differences†between the left and right ears to triangulate the origin of the sound rather than comparing volumes. This causes hearing disorientation and a “not quite sure†feeling about where the sound is coming from.
(Via Make.)
