Street Art Graffiti On Trains

Artists have challenged art by situating it in non-art contexts. ‘Street’ artists do not aspire to change the definition of an artwork, but rather to question the existing environment with its own language. They attempt to have their work communicate with everyday people about socially relevant themes in ways that are informed by esthetic values without being imprisoned by them. John Fekner defines street art as “all art on the street that’s not graffiti.”
Techniques
Whereas traditional graffiti artists have primarily used free-hand aerosol paints to produce their works, "street art" encompasses many other media and techniques, including: LED art, mosaic tiling, murals, stencil art, sticker art, street installations, wheatpasting, woodblocking, video projection, and yarn bombing.