DEVORAH SPERBER Holbein’s “Ambassadors,” with its anamorphic vanitas skull, and Vermeer’s “The Music Lesson,” reputedly composed with a camera obscura, have been digitally translated and re-created with “pixels” made of commonplace materials like spools of thread and pipe cleaners. The familiar images appear when viewed through a clear acrylic sphere or as a reflection in a stainless-steel cylinder. Through May 28. (McKenzie, 511 W. 25th St. 212-989-5467.)