Blind people show that they do understand what sighted people process through vision, according to a new study. The findings prove that “visual” ideas don’t require vision. The research, published in PNAS, involved 20 blind and 20 sighted adults. Rather than rely on rote learning, scientists found that blind people make sense of the visual world by using a catalog of clues.

“In the absence of direct sensory access, knowledge of appearance is acquired primarily through interface, rather than through memorization of verbally stipulated facts,” the scientists write.

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“Scientists Discover How Blind People Know So Much About Appearances”