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Duck-Rabbit optical illusion first published in Fliegende Blatter (Munich), October 23, 1892, p. 147. The same drawing, or a similar version, has subsequently been attributed to Joseph Jastrow (1899) and quite erroneously to Ludwig Wittgenstein (2002). The Fliegende Blatte version, by an anonymous artist, appears to be the oldest and first published version.
Jastrow's Duck-Rabbit drawing is based on an illustration published in Harper's Weekly (November 19, 1892, p. 1114). The Harper's Weekly drawing was based on a similar drawing published in Fliegende Blatter, Munich (October 23, 1892, p. 147).
Sigmund Freud, born Sigismund Schlomo Freud; 6 May 1856 – 23 September 1939) was an Austrian neurologist who became known as the founding father of psychoanalysis.<br/><br/>Freud qualified as a doctor of medicine at the University of Vienna in 1881, and then carried out research into cerebral palsy, aphasia and microscopic neuroanatomy at the Vienna General Hospital. He was appointed a university lecturer in neuropathology in 1885 and became a professor in 1902.