It is here that we find the basic difference and juxtaposition between his film aesthetics and those of Pasolini and Fellini. Pasolini raises the language of film to that of literature, writing, with its syntax, semiotics, etc. Fellini’s method, where each scene is put together in the same way as a painting is on canvas, was even more unacceptable to Tarkovsky. What will you have if, instead of a figure drawn on canvas by the artist we see a live actor? This is a surrogate painting, a “live picture”.
A great article on Tarkovsky's films and their connections to painting. Solaris is highlighted - along with Nostalghia and Andrei Rublev.