Hungarian mathematician John von Neumann could recite exactly word for word any books he had read, including page numbers and footnotes-even those of books he had read decades earlier [REF].
Unusual cases of eidetic memory include: Sergei Rachmaninov, a composer and pianist who could recall a musical score after sight reading twice; and savant Stephen Wiltshire,[REF] who is able to draw a skyline in detail after a single helicopter ride [REF].