"The painter of the future is a colourist such as there hasn’t been before,” Vincent Van Gogh wrote to his brother Theo shortly after he moved to the south of France in 1888.

This year marks the 200th anniversary of the National Gallery in London – and the 100th of its acquisition in 1924 of two of Van Gogh’s most famous paintings: Van Gogh’s Chair and one of several versions he painted of one of his most loved pieces, Sunflowers. What better time for the gallery to host – surprisingly enough – its first-ever major exhibition of his work.