"This is not the wall you are looking for." #GraffitiWithoutGravity street artist @shanesuttonart completed his work at #ESTEC in NL @ESA_Tech and was then escorted off-site by representatives of the #GalacticEmpire ;-) More at https://www.flickr.com/photos/europeanspaceagency/42825149960/ Thanks @THStreetArtTour! https://twitter.com/esa/status/1039901899867271168/photo/1 source: https://twitter.com/esa/status/1039901899867271168