Kari Kivisalo wrote:

> There is also audio version of the impossible staircase:
> http://www.pp.htv.fi/kkivisal/down.mp3

Cool.  The illusionworks website talked about this but it was in some
format that I didn't have the plugin for.  It said that the pitch is
played in multiple octaves at the same time.  The intensity of the pitch
in each octave is fit to a bell curve so each tone fades in, then out.
Thanks!

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