I am amused by the fact that someone finds the appearance of a bar in 7/8 unnatural amidst all the activity on this page. Is the number seven unnatural? Many flowers, for instance, have seven petals. There are ladybirds with seven spots, even! There is, as far as I know, lots of folk music that uses seven beats in a "bar" (such as that which inspired many pieces of Bartok and Vladigerov from Eastern Hungary and Bulgaria). Or is it not the number of quavers in this bar but the appearance of this bar in this context that this commentator is disturbed by? I quite like that bar, by the way, and feel it serves as an elegant and understated transition from the initial material to the stuff that comes at the bottom of the page. Also, I don't really think a comparison with a Beethoven sonata would be very useful here. It would, to my mind, be about as useful as comparing the Sorabji, or the Beethoven for that matter, to an artichoke. Perhaps comparing it to other single-movement piano sonatas from the early 20th century would be more instructive. Or perhaps that's just a bit obvious ...
All excellent common sense, of course, although I have to add that the person who claims that he "finds the appearance of a bar in 7/8 unnatural amidst all the activity on this page" rather hard to take seriously when he writes as he did in that instance; I just hope that he doesn't get even more upset either by
Seven Brides for Seven Brothers, the man going to St. Ives or the Book of Revelations. What surely matters here is what is on that opening page of Sorabji's first self-acknowledged piano sonata (there is a slightly earlier one by him which he never sought to have published and this, like the official "first" sonata here and that work's two successor piano sonatas, is also in a single movement).
Anyone who doesn't already know this sonata may be interested to find out about it by obtaining a CD single of it played by Marc-André Hamelin some 17 years ago (still available); this is likely to remain the only commercial recording of the work until one is made by - well, you know who you are! And the sooner the better, thanks!
Best,
Alistair