Previously Unknown to the Art World, His Secret is Now Out. When in 2007 Robert Martiensen was found deceased in his derelict home in rural South Australia an incredible secret was revealed. Throughout the house were stacks of some 7000 framed and unframed paintings-exceptional works of art created after 1990 when he retired as a mathematics teacher. Quick thinking and rapid action by this book’s author saved this collection from destruction or dispersal. Martiensen kept his painting a secret, never seeking to exhibit of sell his creations. As his story is told by Dr Elizabeth Arthur, he emerges as an enigmatic, erudite, inflexible and obsessive figure, someone who might well be described as an ‘Outsider Artist’, a rare, ranging talent on the margins of the art world. More than 500 colour reproductions of Robert Martiensen’s paintings are included in this book-artworks that clearly demonstrate his fluctuating moods and intellectual interests and exhibit his remarkable aesthetic achievement.