🚀 go-pugleaf

Right!  Here is another web of words:  Mirrors do not reverse left &
right *or* up & down: they reverse forward & backward (or, more precisely,
they reverse the direction perpendicular to them: a horizontal mirror
*does* reverse up & down).  But people in real life exchange their
front & back sides by rotating, not by popping thru themselves; therefore,
we say "the person in the mirror has raised his left hand, whereas I
have raised my right hand", rather than "the person in the mirror has
his face on the back of his head, rather than...".  In the case of a
printed page, if the page is transparent, so that you can read it in the
mirror without turning it over, then it appear unreversed both in the
real world and in the mirror; if you have to turn it over, then *you*
make the choice of reversing left & right or top & bottom, and you
choose the former because you have the person in the mirror in mind.