The Carolusgebouw is a building in the Valkenswaard museums quarter. One of the collections inside is devoted to lithography, the method of printing using polished stones invented in the 1790s by Alois Senefelder. This allowed much cheaper reproduction, especially for images. The museum has one of the largest collections in the world relating to lithography. It was begun by Peter-Louis Vrijdag and includes book illustrations, maps, posters, musical scores and playing cards. Artists represented include Jan Toorop, Kees van Dongen and Alphonse Mucha. There are also several presses, some which are used regularly. They include a replica of Senefelder’s first lithographic press, made of wood. Visitors can try mixing colours or working a hand-press. Printing demonstrations are given regularly, visitors can watch artists at work, and the museum runs workshops for both learners and professionals.