In the figures below we show how the structure g2 is a rotation and stretching over a longer time-scale of the harp glissando g1.  The image on the left is a spectrogram of the passage that constains both the harp glissando structure g1 and the longer structure g2.  The middle image shows a spectrogram with the structure g2 selectively amplified (the other sounds are left unaffected, an altering of the figure-ground relations in the passage)---we can hear the harp notes more clearly standing out from the background.  Finally, the image on the right shows a spectrogram with the structure g2 isolated.  We can hear the harp notes clearly ascending in a long stretched out glissando of harp notes.

                                       
                         Passage containing g1 and g2         g2 amplified, other sonorities intact                  Only the structure g2
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Finally in the figure below, we show a zooming in on this last spectrogram over one octave between 160 and 320 Hz.   The resemblance to (at least part) of the structure g1 is striking.

                                                                               

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