Neither Here Nor There JUDY PFAFF Viewers may walk into this tumultuous, gorgeous show and think: it's Sarah Sze on steroids. But Pfaff, one of the pioneers of installation art, helped pave the way for younger artists like Sze and Jessica Stockholder by first conflating painting and sculpture and then combining it with a scavenger impulse (check out the gargantuan piece of driftwood). For her current outing, she divides the gallery into discrete but overlapping zones, from a crimson explosion of grids (as if "The Matrix" had reloaded in Matisse's "Red Studio") to a meditative pocket of white and pale blue with a suspended lattice of steel stars. Through Oct. 11. (Ameringer Yohe, 20 W. 57th St. 212-445-0051.)