The magick sigil. Simple magical symbols charged with intent. A center piece of Chaos magick, this has been the subject of a lot of books, and, in many cases, so-called "insider" classes on magick masquerading as "manifesting".
This little book, just under 15 pages, and put out for cheap, is a brief instruction manual in creating a sigil, and also embedding it in artwork. By Hiding in Plain Sight, your sigil will activate through the eyes of dozens, perhaps thousands, of minds who will view your art.
Librarian note: There is more than one author in the Goodreads database with this name. This profile may contain books from multiple authors of this name.