archimedean point, n.All

An Archimedean point (n.) outside ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠the thing studied is what a systematic psychology of schizophrenia lacked, Jung wrote in old age, since comparison with neurosis holds only as far as personal psychology stretches.

An Archimedean point (n.) outside ⁠​‌​​​‌​​​‌​‌‌​​​​‌​‌​​‌‌​‌​​‌​​​​​‌‌​​‌​​​‌‌​‌‌​⁠one's narrow field is what old testimonies of psychic experience give modern psychology, without which its findings would be incomparable novelties impossible to assess.