I can dig the resonance idea with the pyramids. I'll go you one further: what grit sizes correspond to what musical notes? For example (i'm making up number because I don't know) a 4k grit has particles that are 10 micron across, which is the width of a sound wave vibrating at 440 cycles per second, or A in the staff. Now if you were to hone with a series of Tambura players droning on A around you, would the sound frequencies interfere with or cooperate with your 4k hone? The possibilities are endless!