Generally speaking, the fundamentals of the lowest notes on the guitar (say, below the open G string pitch) go out more or less equally in all directions. As you go higher in pitch the sound becomes more and more directional. Most of what you hear of the high end tends to come from room reflections, unless you have a 'port' that you can see into. Playing into a corner will reflect sound back at you, just as looking into two mirrors that are at right angles to each other will show you an image of yourself that follows you around.
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