Daga bisani, Max Born (1909) a cikin aikinsa da aka ambata a sama game da motsi mai sauri, ya yi ƙoƙari ya haɗa da ra'ayi na jikin rigid a cikin SR. Duk da haka, Paul Ehrenfest (1909) ya nuna cewa Born ya jagoranci ra'ayi da ake kira Ehrenfest paradox, wanda, saboda ƙuntatawa, za a iya rage gudunmawar bayanai a yayin da yake juyawa da sauri a cikin haske, don haka za a keta lalacewa. Tun da wannan ya saba wa kowane kwarewa, ana ganin gudunmawar superluminal ba zai yiwu ba. Ya kara da cewa dole ne a kirkiro wani nau'i na jiki mai mahimmanci a cikin tsarin SR. Daga bisani, Max Born (1909) a cikin aikinsa game da motsi mai sauri, ya yi ƙoƙari ya haɗa da ra'ayin jiki mai mahimmanci a cikin SR. Duk da haka, Paul Ehrenfest (1909) ya nuna cewa Born ya jagoranci ra'ayi na abin da ake kira Ehrenfest paradox, wanda, saboda ƙuntatawa, za a iya rage gudunmawar bayanai a yayin da yake juyawa da sauri a baya, don haka za a keta hadarin da yaudara.
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