Go ahead and say it; everyone does. Certainly I did. Here’s a striking building, perched on a slope outside the small Austrian town of Leoben — a sleek structure made of glass, wood and concrete, stately but agile, sure in its rhythms and proportions: each part bears an obvious relationship to the whole. In the daytime, the corridors and rooms are flooded with sunshine. At night, the whole structure glows from within. A markedly well-made building, and what is it? A prison.