Claim: Paintings on masonite are a series of paintings numbered I to XXVII from the summer of July 18, 1936, which are all made up of oil, tars and  and casein on masonite and mostly measures 78 × 108 cm.
Evidence: Paintings on masonite is a series of 27 abstract paintings made by Joan Miró using the type of proprietary hardboard known as masonite, just after the Spanish Civil War started on 18 July 1936. Painting I Summer of 1936 Painting XXVII Summer of 1936