Regine Schumann’s fluorescent Plexiglas boxes may have a subtle glow during the day, but under black light, they look like they’ve been plugged in. Schumann combines planes of vividly colored Plexi to create her wall-mounted works, on view now at Gallery Sonja Roesch.

They’re well-crafted, but aside from the very cool luminosity factor, most of the forms rely on standard geometric shapes. Still, there are a couple of very interesting standouts in which Schumann is taking expected squares and rectangles and ever-so-slightly warping the sides in or out. The best is a large square in a radiant “safety orange.”

Schumann has curved the sides outward so slightly that you keep wondering if it is an optical illusion. Subtle alterations like these give the work a very interesting edge.

The show runs through May 7 at Gallery Sonja Roesch, 2309 Caroline Street. For information, call 713-659-5424.