Cinema was the first art form to come into being as a result of a technological invention, in answer to a vital need.
It was the instrument which humanity had to have in order to increase its mastery over the real world.
For the domain of any art form is limited to one aspect of our spiritual and emotional discovery of surrounding reality.
Further reading and research:
Tarkovsky, A. (1986) ‘Sculpting In Time’
Documentary – Sacrifices of Andrei Tarkovsky (2012)
Documentary – Tarkovsky In Italy (1984)
Cinephilia & Beyond – ‘Sacrifices of Andrei Tarkovsky’
Essay – Criterion Collection (Andrei Rublev)
Essay Criterion Collection (Solaris)
Nostalghia.com – A collection of interviews and various research material focused on Tarkovsky.