Cover of book "Wittgenstein" by WW Bartley III (1973) : Ludwig Wittgenstein (1889-1951) austrian philosopher [Getty Images]

UNSPECIFIED - AUGUST 30: Cover of book "Wittgenstein" by WW Bartley III (1973) : Ludwig Wittgenstein (1889-1951) austrian philosopher (Photo by Apic/Getty Images)

Hulton Archive Apic