ɪn nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi fˈaɪv, wˌaɪl hiː wʌz lˈɪvɪŋ æt nˈoʊ twˈɛnti fˈoːɹ, ʃɹˈɜːdɪŋɡɚ ɹˈoʊt hɪz fˈeɪməs "ʃɹˈɜːdɪŋɡɚz kˈæt" pˈeɪpɚ, kɹˈɪɾɪsˌaɪzɪŋ ðə kˌoʊpənhˈeɪɡən ɪntˌɜːpɹɪtˈeɪʃən ʌv kwˈɔntəm mᵻkˈænɪks, wˌɪtʃ pɹəpˈoʊzd ðætðɪ ɛɡzˈækt stˈeɪt əvə sˈɪŋɡəl ˈæɾəm wʌz ˌɪndɪtˈɜːmᵻnət ʌntˈɪl əbzˈɜːvd.
In 1935, while he was living at No 24, Schrödinger wrote his famous "Schrödinger's cat" paper, criticising the Copenhagen interpretation of quantum mechanics, which proposed that the exact state of a single atom was indeterminate until observed.