It's very interesting.
Your example shows the problems inherent to this kind of interface, though; at times clicking a button would do the exact opposite of what I'm really trying to do.
In other words, using this interface is a very good idea, as long as it's very carefully tested.
Also, the Fahrenheit system is kind of similar, and it works sometimes really well, and sometimes it ends up being very confusing.
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...It's down there somewhere. Let me have another look.
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