Imagine climbing a stairwell for the first time but it feels familiar, like you've been there before but can't remember why.
It is as if another "we" lived elsewhere, and has already got on that same wagon of that same subway and you, unexpectedly, have the feeling that you know what will happen next.
A mirroring memory is therefore generated which makes us believe that we have experienced that situation before.
This sort of premonition makes us question our experiences, our memories and even the linearity of time.
Uselessly, we then try to give a meaning to something that is, perhaps, nonsense and absurd.