As Donald Trump finished his record-length State of the Union address earlier this year, a group of artists drove to a cul-de-sac off Echo Park Lake in L.A. and got to work. The three men dressed in loose-fitting work pants and hoodies unloaded two laser projectors (one for backup), some lenses, a laptop and battery packs onto carts and brought them to the middle of a pedestrian bridge that crosses over the 101.