When it comes to set design, Center Stage has an unfair advantage. It can afford two-tiered sets that roll back and forth—Fells Point Corner Theatre can’t afford the insurance for such aspirations. But FPCT did pretty well with Mark Wright’s set design for Mark Scharf’s Blue Mermaid. The play itself involves a painter, which always places an extra burden on a set designer. Wright managed to blend atmosphere with theme in a coherent, striking three-dimensional set that appeared to be an extension of the driftwood motif. Wright had us convinced that it was wood; Scharf popped that bubble by telling us that it had been constructed with used screens. At any rate, considering the resources available, it was impressive.