"lestrout" wrote in message
...
the spent females, which of
course swim around as their penultimate act, were just under the
meniscus, upsidedown! And the air bubble entrapped by their wings was
underneath the bod.

Now: how in tarnation do you imitate that geometry? What would Isaac
Newton do? Or Galileo? LaFontainish tricks like sheaths, air bubbly
thangs, etc, would make the fly turn rightsideup, which is to say,
wrongsideup.

Hmmmm?

and further....what do you think the trout keys upon?
Do you think they consider rightsideup, upside-down or
whatever, or merely judge size, color, motion and position in the water
column? Hmmmmm, indeed!
Tom
.....the fun things winter brings to ponder!