What would it be like to occupy the brain of a non-human being? This is a question that has inspired writers (Franz Kafka's Metamorphosis), philosophers (Thomas Nagel's "What is it like to be a bat?") and just about every curious human being. It is this curiosity about different forms of being that helps explain our fascination with the writings of Oliver Sacks. Although Sacks's books generally deal with altered states, this new one on visual experience brings it home more clearly because, for the sighted among us, "what it's like to be" tends to get fleshed out visually.
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