Amy Sillman’s polymorphous works on paper offer an innovative and sincere interrogation on the possibilities and technical complexities of drawing. Mostly sticking with a single format of 40 1/8 x 26 inches within simple white frames, Sillman offers a multitude of visual focal points. Dynamic, thick brushwork that veer from forceful to ambiguous are carefully laid over abstract color planes allowing occasional glimpses of delicate grids of silkscreen. Unconventional and challenging, Sillman’s formalist works display a brainy beauty and an enticing sense of color; as if by happy circumstance Sigmar Polke and Laura Owens decided to do a suite of drawings that they then called paintings. At Gladstone 64 through March 3.