Andrew Witkin won the Institute of Contemporary Art Boston’s 2008 Foster Prize for a methodically arranged installation of personal effects and simple furniture made from Baltic birch plywood and square, stainless-steel screws. LaMontagne Gallery recently featured that work’s companion project, “Others Among Others,” in which those elements once again come to life as poetic statements on collecting that convey the artist’s melancholic passions. Witkin, who is director of Boston’s venerable Barbara Krakow Gallery, demonstrates a knack for organizing space and displaying objects as precious