They build the buildings starting from the ground level and add to it little by little. So little by little the ground got further away. So they got used to it slowly. That is why they could easily just lay around 50+ stories off the ground.
It be like working with a baby cub tiger till it was fully grown and you are not afraid of it because in your eyes it's that little cub who pawed at your ankles. But anyone else sees a full grown tiger and wonder how the hell can you let it hug you.
They didn’t actually have lunch up there. The second photo is one of many. This famous photo was staged for publicity. It was part of a PR campaign as people back then found it just as fascinating and far out as we do now.
It be like working with a baby cub tiger till it was fully grown and you are not afraid of it because in your eyes it's that little cub who pawed at your ankles. But anyone else sees a full grown tiger and wonder how the hell can you let it hug you.