The Kaeru-An Collection at the National Gallery in Prague comprises 523 scrolls of Japanese Zen ink painting and calligraphy, a few items of earthenware, and one pair of screens. The collection was built over the course of the past twenty years by the Dutch collector and artist Felix Hess, with expert assistance from the professor John Stevens. Three years ago, Felix Hess donated this exceptional collection of Japanese Zen art, spanning from the 15th to the 20th century, to the National Gallery in Prague, which has recently presented part of the collection in two installations of works in the exhibition ‘Zenga: Japanese Zen Paintings from the Kaeru-An Collection’ in the Salm Palace by Prague Castle.