"Street art is visual art created in public locations, usually unsanctioned artwork executed outside of the context of traditional art venues. Common forms and media include spray paint graffiti, stencil graffiti, wheatpasted poster art, sticker art, street installations, and sculpture."

art, tumblr, and background image
art, daisies, and painting image
art, paris, and sreet image
grafiiti image

I think that art in public places is something beautiful. The artist has chosen to share his/ her artwork with the world. Street art is a unique way of sharing art publicly.