The car stereo loud and heard well away from the moving car but playing something simple: repeating three notes of a major triad slowly in descending order on an acoustic guitar.
When the car has passed out of hearing distance, I find myself humming the same three notes in the same descending order but soon discover that, while I can do that capably enough, easily in fact, I can’t hum those same three notes in reverse order. … I can’t even hum the first note of the ascending triad, even though it’s the same as the last in the descending triad, which I have just hummed…. I give up after a few attempts.
.i`` * ^ / . . . . . ` `~ 