Strindberg's paintings were unique for their time, and went beyond those of his contemporaries for their radical lack of adherence to visual reality. The 117 paintings that are acknowledged as his were mostly painted within the span of a few years, and are now seen by some as among the most original works of 19th-century art. Today, his best-known pieces are stormy, expressionist seascapes, selling at high prices in auction houses. Though Strindberg was friends with Edvard Munch and Paul Gauguin, and was thus familiar with modern trends, the spontaneous and subjective expressiveness of his landscapes and seascapes can be ascribed also to the fact that he painted only in periods of personal crisis. (https://en.wikipedia.org/wiki/August_Strindberg#Other_interests)