A main characteristic of street art is the "temporary" aspect which is naturally associated with this art form. With each new tour through the city you will discover new graffiti and stencil pieces. Wherever you come across street art today it may be painted over or sandblasted away tomorrow. This transitory nature makes street art so interesting. By the time you're done with this post, new stencils and graffiti will surely be added on some walls somewhere in Buenos Aires.