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.
Papildus tam, kas ir pa kreisi, pa labi, atpakaļ, uz priekšu, uz augšu un leju, Kaluca izteica domu, ka pastāv vēl papildu telpu dimensiju, ko mēs kāda iemesla dēļ neredzam.