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Sometimes, it's just as much about the art form as it is about the work itself. When it comes to urban art, for example, it's also very much about the medium through which that art is expressed. Because street art is illegal in most places and often painted over for this reason, graffiti can be on surprisingly hallowed ground in today's world.

When it comes to the really good stuff? Its fleeting nature makes it all the more beautiful and expressive. Massive and yet incredibly detailed urban murals could be there one day and gone the next. 

That's why we combed Instagram for the very best of today's #streetart from all over the world. Even if it may no longer exist IRL, these works of primarily spray paint art will forever live on via hashtags and Instagram posts. Keep reading to check out some of the most eye-catching urban art we gathered from all around the globe.