No one writes cards anymore. Except, that is, the artist Keith A. Smith. For the past five decades, the artist has been trying to stay in touch with exquisitely handmade cards. Smith uses collage, painting, drawing, embroidery, and printmaking on the 5 x 7 postcard format to remind people that not everything needs to fit into the 140-character format and that sending a handcrafted message is a special kind of friendship and affection. Humorous, lyrical and sometimes anxious, Smith’s missives are mini-artworks that only require a postage stamp and elicit an emotional response no e-mail can ever replace. At Bruce Silverstein through May 6.