Otten & Otten collectionot-artWillem Otten Instagramwooden-birdwooden-bird InstagramAnthony Petullo art collectionCollection de l’art brutGalerie für Polnische VolkskunstMuseum of American folk artMuseum Charlotte Zander BönningheimMuseum van de GeestMuseum dr. GuislainMoscow Museum of outsider art Film by the collectors couple Horst en Gisela Riedel (German language 9,45 minutes)
