Hans - Ju ̈rgen Hafner, 2016 commented: The impressive thing about Rainer is how unconventional, and above all how quickly he covers the scope of what is possible in painting, and reorganises it for himself alongside local
tradition and connection with the international
Modern Movement, anti-academicism and outsiderhood,
pictorial symbol and the act of painting, conceptualisation and phenomenology, surrealism and abstraction»