MIXING IT UP E1 Studio is brimming with creativity. The workspace and exhibition venue, tucked into the alley behind Speeder & Earl’s on Pine Street in Burlington, features lively mixed-media installations, constructions and paintings by Kerri Workman, Eammon Coughlin and Martha Hull this month. Coughlin’s black, white and gray “Earthbound Ghost“ (pictured) nicely fuses spray paint and India ink, exemplifying the multiple-media approach that pervades this show.