Yours, Mine, or OURS?

In questioning copy right and fair use, I began with an image of a CBS billboard. Billboards almost exclusively use copy right protected commercial material to sell or advertise something. Instead of using this for an advertisement, I manipulated it to be a canvas. Within this canvas, I choose to use a combination of other peoples work. For example, two photographs I took of street art in New York and Pittsburgh create the background texture. Over this I used recognizable logos and advertisements which are directly protected under copyright. When collaged together all of these things form a new image that is mine.