Stefan Ossowiecki’s clairvoyance experiments

Record summary

Stefan Ossowiecki was a Polish engineer and prominent clairvoyant who performed experiments involving sealed objects, drawings, hidden information, and psychometry before researchers and public audiences. He became an important figure in Polish psychical research during the interwar period, and accounts of his abilities circulated internationally. The case supports comparison of experimental clairvoyance, nationalist occult culture, testimony, and the role of a respected professional identity. Results are difficult to evaluate because protocols varied, records were incomplete, and later narratives often selected successful trials while minimizing failures or opportunities for information leakage.