Muralists
Nowadays we relate murals to urban art and graffitti, but the big murals as a noble art form dates back to ancient times, egiptian tombs were painted, Leonardo da Vinci painted his famous Last Supper.
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In modern times the top reference remains with the mexican muralists - Rivera, Siqueiros and Orozco
In Portugal, murals became associated with political statement by parties after the revolution of 1974
A great portuguese contemporary graffitti artist is Bordalo II, who makes murals with industrial junk
Another great urban artist is Vhils, who uses different technique to make portraits on the walls
Odeith follows the traditional can painting graffitti for 3D pictures- https://youtu.be/gPdbLec1chs
Eime paints with stencils - https://youtu.be/w4Bv7i-3xgo