One walk through three sounds, recorded twice: binaural for headphones, stereo for loudspeakers. You hear the sounds as the listener hears them.
For headphones. The listener is drawn as a head.
For loudspeakers. The same walk picked up by a pair of microphones, drawn in place of the head.
Binaural audio places sound around your head the way you hear it in a real space, so it only works on headphones; on loudspeakers the spatial image collapses. The stereo version is made for loudspeakers.
In the example, a listener walks for two minutes across an Atlas: a map of 200 by 200 meters holding three sounds. A field recording from the Old Elbe Tunnel in Hamburg and a singing bowl recorded at EMS Stockholm are each decoded as a cube of eight virtual loudspeakers; Principles of Nature and Grace (2017), a fifth-order ambisonic piece, is spread over 85 points around a larger sphere. As the listener approaches, passes, and turns away from each sound, it moves around you.
The map turns with the listener, who always faces up, so what you see matches what you hear. A plan in the corner shows the whole walk with north up.
How the Spacesizer composes with space is explained in the trailer; the QR code at the end of this example leads there too.
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