Interesting. Looking at the photos of the ends, the bottom looks symmetrical, but the top isn't. That sort of makes sense for holding it. Most people would hold it one handed near the bottom, so holding it in the left or right hand wouldn't to much different.
As to the shape of the back, my first thought was "weird". But, when I look at the photos of people holding it, I think that wide channel will make for a comfortable and safe grip.
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