The relationship between sight and memories is referenced several times in "Blade Runner". Rachael's visual recollection of her memories, Leon's "precious photos", Roy's discussion with Chew and soliloquy at the end, "I've seen things you people wouldn't believe". However, just as prevalent is the concept that what the eyes see and the resulting memories are not to be trusted. This is a notion emphasized by Rachael's fabricated memories, Deckard's need to confirm a replicant based on more than appearance, and even the printout of Leon's photograph not matching the reality of the Esper visual.