We also need to define who 'we' are. What proportion of the world's population needs to notice before we've noticed? In a Singularity, I don't think we would n

We also need to define who 'we' are. What proportion of the world's population needs to notice before we've noticed? In a Singularity, I don't think we would notice the AI itself, but only its effects. Suddenly things will just get a lot easier and/or a lot worse depending on who you are and the fitness function of the underlying AI engine. (I tend to believe that a sentient, recursively self-improving AI wouldn't be able to decouple itself from the fitness function of its pre-Singularity origins)