Contributed by Riad Miah / Artists often become domestic partners. It’s an iteration of human nature. For one person to be attracted to another who has a similar creative sensibility and lifestyle is normal and sensible. Well-known examples include Robert and Sonia Delaunay, Dora Maar and Pablo Picasso, and Jasper Johns and Robert Rauschenberg. While coupledom can be exhilarating for both partners, it can also be tense, competitive, and destructive. Linda Griggs and Allen Hansen had never considered showing together until settling on their current show at Equity Gallery, aptly titled “Feedback Loop.” They appear to have struck a healthy balance between separation and synergy.