THERE IS A STRIKING DISJUNCTION between reproductions of Damián Ortega’s Cosmic Thing, 2002, and the real article currently on view at Boston’s Institute of Contemporary Art in his first major survey, “Do It Yourself.” In photographs, this dismembered 1989 Volkswagen Beetle is suspended like a digital chimera—a lost specialeffects explosion from The Matrix, perhaps. In person, objecthood returns with a vengeance. The metal wires, taut with weight, are insistently visible, and instead of a futurist celebration of technology there are merely the rusty, dirty, and fraying parts of an old car.