The simple feeling that it's strange to be here, strange to find yourself existing. If it is a feeling it is fairly commonplace ingredient of a great many other functional feelings, not all feelings even insofar as they all include 'being here', but a very respectable subclass. If it were just a feeling it would be spice, but it is something more, an intellective feeling, something like that. All true intellect has some deep and complex feeling tone, the kind that hasn't any at all is not real intellect at all.