Claim: Paintings on masonite are a series of  27 abstract paintings by Joan Miro numbered I to XXVII from the summer of 1936 which are all made up of oil, tars and  and casein on masonite(hardboard) 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 78 cm × 108 cm (​32 ⁄4 in × ​40 ⁄4 in) Summer of 1936 Oil, tar, sand and casein on masonite Painting XXVII Summer of 1936 Oil, tar, sand and casein on masonite