Your Name on a Wall

Peter Prevos explores how writing one's name on a wall is an act of magic:

Magic is a psychological force – a means to understand our position in nature. Although some might argue that magic has been wiped from contemporary culture, it has never actually disappeared from our psyche. Simple acts, such as writing your name on a wall are in fact magical. To some this is a simple act of vandalism, but that is not the real motivation for people to do this.

Writing your name on a wall makes the wall becomes an extension of yourself and you become part of the wall. It is a way to exert our self onto the world. This is I think the deeper psychological reason for the popularity of tagging. Tagging is a way to impart part of your self onto the environment in which you live. This is in essence an act of magic because it is a way to connect the inner world (psychology) with physical reality. There is no rational reason to write your name on a wall.

See his full discussion here.