I believe it was Walter Roper (or perhaps it was Steve Herrett) who observed that if you take your empty hand and clasp it as if grasping a gun, the shape of the empty space inside your hand resembles an ice cream cone, similar to the shape of this grip- narrow at the bottom and wider at the top.

The problem with mimicking this when it comes to handgun grips, however, is that while such a shape seems, on the surface, to be a natural choice, a grip shaped like this will tend to swim upwards (raising the bore axis) and out of the hand as pressure is applied to due the hand firmly grasping the grip and/or recoil. This might not be quite as apparent with a sticky rubber grip but a smooth hard grip shaped like this Ergo grip would be a nightmare trying to keep ahold.

There's a reason most grips are shaped larger at the bottom than at the top, however counterintuitive it may look (keeping in mind the ice cream cone). With such a grip recoil or grasping pressure forces the grip down in the hand, keeping the hand high on the gun and lowering the bore axis, which is far more preferable.

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SWHF #448