If there is now a corner of our head space that is laid out by being connected to everyone, anywhere, all the time, then it has a birthday.
In the UK it's the period between 1998 and 2001, by the end of which it felt annoying to have to make arrangements with someone who didn't have a mobile phone, even for people like me who had only just got a mobile phone themselves!
(Not having one now seems like a quaint if mannered fashion choice.)
In Finland and Japan the birthday is earlier? In America later? In Africa still to come?
And the closest comparison?
Mass literacy?
That is over stating it (though maybe not in Africa, for economic reasons) and it's not quite a direct comparison.
But being able to read is a head space.
Novels and newspapers were made to go in it. As were train timetables.
If there is a mixed reality head space, what goes in it?