The collection was donated by the founder of the Stiftung Insel Hombroich, Karl-Heinrich Müller (1936–2007). In addition to his personal estate, it contains an extensive library on the collection areas pursued by Müller, such as 20th century art and architecture and the art of non-European cultures.
To be sure my art library doesn’t have the traits of a scholarly project – rather, what it manifests is the activity of a collector. So if Schwitters took my interest, then I’d collect everything you could possibly find in the way of catalogues, letters, postcards, of books by and about him. The same went for Arp or Yves Klein and Jean Fautrier, for whom I’d blood-hound it to the farthest nook or cranny in France that might yield a copy.
Karl-Heinrich Müller, 2002