Joan a Galtonic Visualizer + 

The most sceptical scientific reader may therefore accept as a flat fact, carrying no implication of unsoundness of mind, that Joan was what Francis Galton and other modern investigators of human faculty call a visualizer. She saw imaginary saints just as some other people see imaginary diagrams and landscapes with numbers dotted about them, and are thereby able to perform feats of memory and arithmetic impossible to non-visualizers. Visualizers will understand this at once. Non-visualizers who have never read Galton will be puzzled and incredulous. But a very little inquiry among their acquaintances will reveal to them that the mind’s eye is more or less a magic lantern, and that the street is full of normally sane people who have hallucinations of all sorts which they believe to be part of the normal permanent equipment of all human beings. + 