I'm a beginner, having a great deal of fun with my recently acquired Elise (though having to work around my wife's dislike of the volume and timbre). I've also played around with "Duettina", an iPad app that simulates a Wicki duet. The app allows one to switch between a standard left hand arrangement (which is ironically referred to as "Inverted") and a mirrored version (which the app labels "Normal"). I've particularly been using the app to explore left hand accompaniment.
The saga continues:
As you can see there is quite a tradition of left to right rising pitch, and left to right for flat chords to sharp chords.
It goes with out saying that pianos have this, and organs too, inspite of the fact that on an organ with two keyboards it would be possible to mirror the two keyboards.
the Crabb family made me a very nice medium sized Duet concertina with my arrangement of buttons, and i expected this to be just a one off, just to suit my personal tastes. Howev