Um, actually, it's normal. Even Windows behaves in the same manner as do most other programs. Graphical stuff on computers are not necessarily on a cartesian plane. 0,0 is always absolute and it starts in the upper left corner.
Yes, but do you know why they do that? It is done for the people who don't know about this.
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Creator of the original 'spam' icon. Worst mistake I ever made on these forums.