Topic: 2 things, one for you to try and the other is a Question.
OK try this............ form a three string Am chord and tap on the face of your guitar about 2-3 inches below string #1 and 2-3 inches from the bridge or about the middle of your pick guard. Now move to an E and back to an Am then to an E. tapping the whole time.
Now Strum on the Am and move to the E and tap.
Pick a tap rythem other than 1-2-3 try 1&2&345. then. Listen carefully, really carefully. Tell me what you hear. You can go E-Am or Am-E doesn't matter. If you hear what I hear it really cool. (doesn't seem to do it with other chords)
#2 I was in Guitar center the other day in their Expensive room. Martins etc and picked up a Taylor and strummed on one chord and stopped. HOLY Smokes. I did it again even harder. What do you think happened.?
Take a guess. I check back later when there are enough guesss I tell you what I heard.