Whenever an artist produces something so boggling and so inexplicable as to defy more than a cursory understanding at first brush, I am reminded of the science-fiction writer Arthur C. Clarke’s suggestion that “any sufficiently advanced technology is indistinguishable from magic.” There was magic in the air on Thursday evening at the Eyebeam Art and Technology Center in Chelsea, when a new piece by Eli Keszler, “L-Carrier,” was introduced before a rapt audience.