These are 'pieces' - graffiti painted on legal walls.
As there are technical and very physical skills that needs maintaining when doing this kind of work, I try to paint at least once a week all year round.
Piecing can be a very social event when doing a production piece (a wall where everyone agrees on a theme, colours, style and/or background), as well as a nice way to spend hours being creative outdoors. I consider this urban land-art.
Playing around with letters is the backbone of graffiti - the shapes and structures are important and so less significance should be put on the 'word' itself.