Thanks for that Bill. I hadn’t seen that Dial-a-Moon site before. It is very useful.
Indeed it shows exactly this effect, produced by the far wall of Bailly catching the light while craters to either side just beyond it, Hausen and Le Gentil, are totally dark. The effect was particularly striking with the field of view on the camera being only about 2.5 Bailly diameters wide. It’s more explicable when seen in the wider view. I also viewed it the other way up (I always invert my images to make them celestial N up for publication), and it seems to look, for psychological reasons, more strange when viewed that way: almost like thew apex of a house roof – see below.
The familiar Moon can certainly throw surprises.