In his L'art de toucher le clavecin, Francois Couperin specifies that the student should sit exactly 9 thumb-lengths away from the keyboard.
good to know. I'm also supposed to have good posture my feet should be flat on the floor and my wrists should not rest on the table.
ooooops.
also: I don't know if my arms are long enough for 9 thumb lengths.....
"snow on the mountains"
not if the environment keeps going downhill the way it is...
touche.