Early spring is a strange time in New York’s gallery world. The winter shows are coming to an end, and many venues are waiting until the influx of traffic around the May sales to mount their next big events. And yet on Thursday nights, there is almost always a round of shows debuting, attracting a seemingly endless stream of gallery goers. Sometimes you walk into a show you thought would be fascinating, and realize the art leaves you cold. But more often than not, a quick walk through Chelsea reveals unexpected and interesting new discoveries. Last night, for instance, I had plans for dinner at Cookshop, which gave me the opportunity to stop in at Olney Gleason’s shows of Leonor Fini and Arjan Martins.