Cause of death: cancer
Robert Delaunay (French: [ʁɔbɛʁ dəlonɛ]; 12 April 1885 – 25 October 1941) was a French artist of the School of Paris movement; who, with his wife Sonia Delaunay and others, co-founded the Orphism art movement, noted for its use of strong colours and geometric shapes. His later works were more abstract. His key influence related to bold use of colour and a clear love of experimentation with both depth and tone.
Source : Wikipedia
