Two separate themes connected the artists in The Other Primary Colors, a group show at Space Gallery. First, as indicated by the title, all of them used neutral shades. And second, they all created pieces in the context of contemporary abstraction, with everything owing a debt to either minimalism or pattern painting. Guest curator for this show was Marks Aardsma (who dropped her first name, Jo, for the outing), who invited a wonderful roster of fellow travelers to join her in the realm of conceptual abstraction. That list included Tonia Bonnell, Nancy Koenigsberg, Carlene Frances, Corey Postiglione, David Sawyer and Space owner Michael Burnett. Elegant and impressive, the show lent an unexpected contemplative quality to the sometimes raucous gallery.