 Two famous examples of cast iron as both support and decoration of a roof on slender columns are the two great mid 19thC libraries of Paris, the double-arched roof of the Bibliothèque Sainte-Geneviève reading room, built 1843-51, by architect Henri Labrouste, who also designed an even more elegant multiple-domed reading room for the , built 1861-68.Cast iron, a durable material that take on any shape, was also popular from the mid 19th Century for street furniture.Not only park and building fences, often with elaborate gates, but also street lamps, bollards, tree grates and guards, as well as the UK red post box, and in Paris it was used for the elaborate advertising columns, newspaper kiosks and pissoirs the city is known for (though almost all are now contemporary reproductions in other materials).