Einstein (1907b) akakurukura mubvunzo kana, mune zvakasimba miviri, uyewo mune dzimwe nguva dzose, kumhanya mashoko anogona pfuura kumhanya chiedza, uye akatsanangura kuti mashoko aigona ichitumirwa pasi izvi ezvinhu kare, saka causality kwaizova kutyora. Sezvo izvi zvinopesana zvachose pamusoro ose ruzivo, superluminal velocities vanofungidzirwa hazvibviri. Akawedzera kuti munhu simba pamusoro zvakasimba muviri anofanira akasikwa mukati SR. Pakupedzisira, Max Born (1909) panguva basa rake pamusoro-kutaurwa pamusoro kukurumidza kufamba, akaedza kusanganisira pfungwa zvakasimba miviri kupinda SR. Zvisinei, Paul Ehrenfest (1909) akaratidza kuti Born kuti pfungwa kutungamirira inonzi Ehrenfest Paradox, umo, nokuda contraction, ari velocity mashoko anogona kupfupikiswa apo kutenderera disk rakapfupika, saka causality kwaizova kutyorwa. Zvisinei, Vladimir von Laetz (1910), apo achitsanangura "mucherechedzi chaiye" uye vamwe, akataura kuti hazvina kushandiswawo nokuti "chinhu chakasiyana pakati rinomiririra rinomirira muviri uye rinomirisa muviri", asi akanga aionekwawo rinoshanda nokuti pfungwa pamusoro
mashoko