I have an Acutech GP ball head. One of its claims to fame is that it can be configured as a leveling base for shooting panoramas, essentially using it upside down. I also see the Arca Swiss P0, which is a native upside down design. Pix: Typical ball heads have a pano feature in their base and most of Acratech's advertising photos show the GP in that configuration. To use the pano-in-base designs, you first have to level the tripod (or add an expensive leveling base) and then you have to level the camera platform on the ball head. With the upside down design you just level the camera platform and you're done. As far as I can see, the upside down design provides the same camera movements as the conventional design. So I have been thinking about this (Dangerous, I know) --- Why is this not a better configuration for all ball heads? Why wouldn't it be better if Acratech just built the thing upside down from the beginning? Why doesn't everyone build them this way? What am I missing?