Harry Potter, the MOD, was reborn anew into the 1920s, at the height of Grindelwald's reign. - Gellert was not expecting for there to be a child in the villa - an infant, really. Nor was he expecting the boy, no older than three, to turn into a fine, black mist that darted out of sight.
The Mirror of Erised shows the beholder their heart's desire. Warm socks – we know the headmaster was lying. What does Dumbledore really see in the Mirror? And why socks?