Tish Gance, who knows the ins and outs of sewing backward and forward, figured she had something to share. So she opened HISS Studio (Happiness Is Simple Sewing) inside, of all places, Z Art Department, the unique modernist gallery on Speer run by Randy Roberts. Classes are small, with one-on-one instruction for sewers of all skill levels; machines are provided, and for the most basic workshops, so are the needles, thread and fabric (more advanced students must purchase materials from a supply list). And the only thing you take away from a class is knowledge and a completed project, as Gance sells only her expertise and time.