The Chicago studio Luftwerk have made a career out of exploring the interplay of color, light, and colored light, as so many artists before them have done and so many will continue to do. But the defining factor of their work has always been its interaction with architecture, whether the duo were projection-mapping a light show onto Falling Water or bouncing trippy patterns off Anish Kapoor's bean in Millennial Park. This month, however, they left behind that construct to mount their first solo gallery show, at Chicago's Volume Gallery, where it's their ideas alone that are on display.