Opening Thursday, May 1 at Gallery Paule Anglim, San Francisco is “Caerulea,” a solo exhibition by Clare Rojas. Rojas’ focus of the past several years has been on abstraction and color, building 2-dimensional compositions from panes of color that meet and interact. She creates spaces that trigger perceptions of both flatness and depth, playing with the optic energies of blocked areas of colors touching, overlapping or receding in the picture plane. Some shapes seem to bend or fold. Perfectly straight edges partner with hand-drawn lines to form her solid shapes, indications that the paintings are not about pure geometry. Making visible brushstrokes, Rojas’ process reveals a hand-made textural quality that, together with unexpected combinations of colors, distinguishes her work from reductive forebears.