The piece I was confused about, The Methedrine Cardinal, is actually an image of Angus MacLise by Ira Cohen, which looks like this:
As for Angus MacLise himself, he was a percussionist who’s life and work are very inspiring to Eric. Initially the drummer for the Velvet Underground, he left the band to pursue more esoteric paths in music and wound up in Kathmandu, where he eventually died of tuberculosis. It’s true that various drones, tones, and vibrations can produce certain reactions in people, some of which can be felt physically. You can read a more detailed synopsis, including a brief description of the show we’re at in this comic, here.