Blade Runner

I really loved how this film used the eye as a symbol throughout the film.  One of the first scenes of the film is Leon's pupil dilation test, which determines if the subject exhibits empathy and is thus considered human.  Throughout the film, Blade Runner explores what it means to be human.  Is it enough to have selfhood?  What does it mean to have a soul?  The replicants exhibit self-confirmation.  For example, as Pris explains, "I think, Sebastian, therefore I am," we see that she believes in her own selfhood.  Humans view the replicants as entities, but not as humans because they believe they lack the essential element of a soul.  The image of an eye shows up repeatedly in the film's opening scenes such as the eye that reflects the fire and smoke coming out of the chimneys and the eye reflecting the Tyrell building.  This crystal blue eye looks eerily like Roy Batty's eyes as he stands in the rain at the end of the film and explains to Deckhard, "I've seen things you people wouldn't believe.  Attack ships on fire off the shoulder of Orion.  I've watched C-beams glitter in the dark near the Tannhauser gate.  All those moments will be lost in time...like tears in rain...Time to die."  As the saying goes, eyes are the window to the soul, so this use of symbolism could be interpreted as a key to the film's exploration of whether replicants have souls or not.