BROOKLYN MUSEUM OF ART 200 Eastern Parkway (718-638-5000)—“The Eye of the Artist: The Work of Devorah Sperber.” The title of Sperber’s mezzanine installation is perhaps an oblique joke: what she’s really exercising is the eye of the viewer. Sperber draws on both ancient knowledge and contemporary findings, from cameraobscura techniques to neurological studies of “top-down processing.” Old Master paintings are broken down into thousands of pixels, each represented by a single spool of thread. Leonardo’s “Mona Lisa,” Van Eyck’s “Man with a Red Turban,” and Picasso’s “Portrait of Gertrude Stein,” assembled upside down on the wall, snap into focus when viewed through a little clear acrylic sphere. It’s a nifty trick, if a bit gimmicky. Through May 6. (Open Wednesdays through Fridays, 10 to 5, and Saturdays and Sundays, 11 to 6.)