Labrouste’s Bibliothèque Nationale has significant aspects from both a modern and more classical era. On the classical side, you can see indications such as the ribbed vaults, columns, and arcuated windows. This can be contrasted with the more modern elements which include the proportions that can be achieved through the new usage of cast iron, significant ornamentation, and also the continual use of “modern” materials such as plaster and cast iron to help achieve the desired effects.