Jessica Eaton’s abstract photographs are mesmerizing — a mash-up of Op Art and homage to artists like Josef Albers and Frank Stella. In “Iterations (III),” her exhibition at Higher Pictures, concentric squares of varying thicknesses and colors pulse and pop against monochrome backgrounds. They have a trippy visual rhythm.

Such compositions may look like relatively simple digital creations, but Ms. Eaton’s process is painstakingly analog and experimental. The squares in the works are wooden cubes that have been painted gray. To make each picture, Ms. Eaton photographs them repeatedly on a single sheet of film, shifting their position and adding and removing red, blue and green filters as she goes, guided by mathematical equations she developed. In this way, she creates the hues we see in the final prints within the camera.