Street art is usually a fly-by-night phenomena, one that the artists prefer no one -- especially the police -- witness. Just ask the Knapper twins, the subjects of this week's Westword cover story
. But Denver has recently taken to the idea of live street-art events. And last Friday night, UnseenDenver (Westword's 2011 Best Of Photo Blog
) sponsored a fundraiser for Arts Street, a sixteen-year-old foundation that provides youth with job skills through art, where two artists, Uni and Square, put up their work right before everyone's eyes at Uncubed, a communal workspace at 2763 Walnut Street.