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Revealing the flood image from left to right probably would've worked better, too.

I dunno, it's kinda intuitive when you have it halfway across that the left side should be "before" and the right side should be "after".

My first reaction was "is this because they drive on the left?"

No, LCD screens work upside-down here, just like our drains are the "wrong" direction.

(Tip for the sarcasm impaired: that's a bad joke.)

Proof: