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The Endless Octave, which you will hear playing shortly, is perhaps best described as the audio equivalent of the Escher Staircase. Initially it sounds like any other synthasised scale, starting at C and proceeding to D, E, F, etc. However, continue listening and one is soon aware that it appears to go on forever, without actually getting any higher.
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Thank you to Douglas Clark, president of Paedia Corporation (www.paedia.com), for allowing this sound file to be used by curiouser.co.uk. An explanation of how this effect is achieved is available as a pdf file from Doug's website: http://www.paedia.com/pdf/E_O_Bro.pdf.