Apparently this was a thing in 1930s London.
Grandpa!
I mean. Really?!
Oh my God, are you people insane?
Baby cages were attached to tenement windows as a way for infants to benefit from fresh air and "the great outdoors" and all that nonsense. It was a reflection of the increasingly cramped conditions of urban living.
And this is in no way terrifying.
(via thesocietypages.org)