english: That is in addition to left, right, back, forth and up, down, Kaluza proposed that there might be additional dimensions of space that for some reason we don't yet see.
non_english: Teda k doľava-doprava, dopredu-dozadu a hore-dolu by mohli podľa Kaluzu existovať ďalšie priestorové dimenzie, ktoré ale z nejakých dôvodov nevidíme.