Reverse painting on glass may be a dying craft, but Christopher H. Martin has been perfecting this skill in his Dallas and Aspen studios and galleries for 20 years. He’s put his own spin on this difficult verre églomisé technique by applying heat, wind, water, paintbrush and pigment in reverse order to a clear acrylic surface. Composed of sheer layers of metallic paint and water, his biomorphic designs are inspired by nature: the movement of ski tracks in the snow, flight patterns of birds, the palette and markings of tropical fish. Martin celebrates the past two decades of work with “Controlled Spill: 20 Years of Painting,” a retrospective of his paintings and prints, including new large-scale pieces, as well as a retrospective book by the same name. Both the book and the show launch Saturday, April 25, 7 to 10 pm, at his eponymous gallery at 1533 Dragon Street., 214.760.1775.