As great as it looks, there's one thing we really like about the Ex Libris line of shelving by Ligne Roset. The ladder! Check out how that library ladder tapers to the top. The shape looks like it is informed by balance. We'd love to get our hands on this without the rest of the shelving system.
However, the system comes with a rail that supports the ladder. We think a similar ladder could work simply propped against a vertical surface, though.