Okay, not appropriate, but I am supposed to share that which may not be as you expected. While I can say the two button water system above is informational, the square....
I keep thinking of the Japanese watermelon farmers which put boxes over baby melons, to make square melons to making shipping more compact and cheaper.
Could it be? Or did some designer have an uncle in the company. It does make more available room in the stall, otherwise, not so functional.