This year marks the 400th anniversary of the painter Caravaggio's death. To celebrate this, Roger Law embarks on a journey to understand this controversial figure.
Caravaggio's dramatic use of light and shade helped revolutionise the world of art, but the technique he employed to achieve this is the subject of passionate debate in the art community.
Artist David Hockney believes Caravaggio used photographic techniques such as a camera obscura, by going into a dark room and using a lens to reflect an image onto canvas.
Artist Adam Lowe, commissioned to reproduce three Caravaggio pieces showing scenes from the life of St Matthew held in Rome's San Luigi dei Francesi, sees evidence of using glass and long-handled brushes.
Although differing in theories, both men agree Caravaggio was not using conventional techniques of applying paint to canvas. But how he did it can never be proved.
Adam Lowe's facsimile of the paintings will eventually be indistinguishable from the originals.
You can learn more about the debate around Caravaggio's work by listening to the first of a three-part series, The Secrets Of The Art And The Artist – Caravaggio, on Sunday 14 March, 2.45-3.00pm BBC RADIO 4.
What are these?