Joanne Mattera blogs about four recent exhibitions – Steven Alexander, Recent Paintings at David Findlay Gallery, Warren Isensee, New Work at Danese Gallery, Chris Johanson, Windows at Mitchell-Innes and Nash (through October 20), and Christian Maychack, Flats at Jeff Bailey Gallery – featuring "four artists (two painters, two painter/sculptors) are building geometry, whether layer by layer, line by line, or piece by piece. There's a strong sense of materiality that runs through much of the work."