I was reading Boingboing and there was a link to this article about Ayahuasca in Peru, and I found it quite interesting, this woman having her longterm depression subside after this shamanistic treatment. And that the negative energies in someone are spirits that have attached themselves to that person. And this: All negative thoughts, shamans believe, are dark spirits speaking to us, trying to scare us into reacting; the spirits then feed on our reactivity, growing stronger and more formidable until they finally rule over us.

So these two drawings are related to that article.