88 note piano question

[A440A@aol.com]

It seems to me, that 88 notes is a logical stopping point for a number of
reasons.
1.  you have about reached the limit of an average armspan.
2.  notes above C have reached the point of diminishing returns, both
harmonically,( C 88 on a Steinway D  is almost 40 cents above the theoretical
multiple of lower C's. Below the Ao @ 27.5 hz,  the ear begins to use
overtones to synthesize a perceived pitch), and in measures of tone
quality,i.e., the first overtone of C88 is over 8,200,  a frequency range we
associate more with timbre than pitch.

Where do you stop?  If bosendorfer could add a couple of octaves at the
bottom,  the lowest notes could be below 0 Hz, and actually become like an
 acoustic vaccuum cleaner,  play the bottom key and you start to make higher
notes disappear!!

"Dang!  What was in that thang?"

regards,
Ed Foote