Street art is visual art created in public locations, usually unsanctioned artwork executed outside of the context of traditional art venues. Other terms for this type of art can be "urban art", "guerrilla art", "independent public art", "post-graffiti", and "neo-graffiti". Common forms and media can include spray paint graffiti, stencil graffiti, wheat-pasted poster art, sticker art, street installations, and sculpture. Video projection and yarn bombing have also gained some popularity near the turn of the 21st century.