These startling black-and-white images where made electronically four decades ago, using signals transmitted by fax machines. The combinations of pictures (hands, lips, a huge housefly), words (“press,” “play,” “prim,” “plan”), and overlapping lines of jittery static suggest concrete poetry illustrated by Robert Rauschenberg. Closer to drawing than they are to photography, Larson’s experiments foreshadowed the digital-image revolution to come, and are all the more fascinating for their primitive grit. Through July 2.