Just realised that I hold it what seems to be counterintuitively and always have despite using the shape for countless years, and wondering if anyone else does the same.

My thumb is in the left concave, and I hold the mouse a little sideways with my ring finger under the lip of the right concave. My pinkie floats free like the good tea drinker I am.

I'm thinking that the pinkie should be in that right concave, the ring finger in dead space between rmb and that right concave, and then the mouse would be held quite straight.

Useless post, just showerthoughts.