Underground art

Rather than being displayed in galleries and museums, most visionary art is displayed online, at music festivals, or other forms of gatherings such as Burning Man and Rainbow Gatherings.

Again, rather than galleries and museums, street art exists in outdoors spaces, utilizing stickers, Lock On sculptures, installations, stencils, and/or spray paint as its medium.

Graffiti is usually an illegal [citation needed] form of street art.

Others say that unauthorized art comes from a desire to spread beauty and make cityscapes more interesting by painting over blank or barren walls.

Guerrilla art falls under that umbrella[jargon]of thought.