english: What you do is stretch your block of space-time along the light world line, then squash it by the same amount, but at right angles to the light world line, and abracadabra!
non_english: Istegnete vaš blok prostorvremena duž svetske linije svetlosti, a onda ga sabijete za istu vrednost, ali pod pravim uglom u odnosu na svetsku liniju svetlosti i... abrakadabra!