Aphantasia (/ˌeɪfænˈteɪʒə/ ay-fan-TAY-zhə, /ˌæfænˈteɪʒə/ a-fan-TAY-zhə) is the inability to create mental imagery.
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Understand this, I mean to arrive at the truth. The truth, however ugly in itself, is always curious and beautiful to seekers after it.Hecule Poirot in The Murder of Roger Ackroyd