Holy Katana
Wait, what?
He put tape on the fretboard and colored it with markers to help him remember which note is which. If you look at them closely, you'll notice that the frets are irregular, so a visual aid is helpful. There are also three different guitars in the videos, each with different intonation systems (although they're all based on the harmonic series).I think his fretboard has a devoted LSD filter
Really what is the mechanism on his guitar?