Ambient can seem above reproach, too lofty and amorphous to criticize. Infuriatingly, this is kind of true: who, after all, is going to tell Stars of the Lid to quit making that track over and over again? At what point do those slow swoons stop working, especially when arranged with such devastating precision? To his credit, Eluvium's Matthew Cooper writhes within the genre, crafting from ambient's cloudy basics sturdy, tangible songs. He sets out not for mood music but starry-eyed, gut-wrenching beauty: angels crying, cities in fast motion, intergalactic travel.