>>2039126Personal theory
Everything around us is energy in its most basic form. The brain takes these energy and is able to make it into a form that is easier for us to understand based on our experiences and knowledge that has shaped us.
Schizophrenics are people who are much more sensitive to this energy. The guy seeing skulls isn't really seeing skulls but "negative" energy associated with that spot and his brain is turning it into a form that "makes sense". Not that obscenities skulls are a normal part of life, but this is the closest image that his brain can think of to represent the energy he's getting from it.
Everyone is capable of "seeing" all this shit but we are conditioned to block it out by society.
You can open yourself up to it though.
Short-cut is by taking psychedelics. Might be fun and interesting to do once in a while to see whats really going on but constant use without any mental conditioning will most likely start to fuck with you because you aren't mentally prepared.
Proper method: Keep an open mind to the metaphysics and do daily meditations, do exercises to astral project, take up a creative skill (drawing, music all helps with mental conditioning).
https://bluefluke.deviantart.com/art/The-Psychonaut-Field-Manual-part-one-PDF-VERSION-516866936 