Otherwise it is imagination. When it comes to mental phenomena such as memories, dreams and imagination, the Social Self suspects these are mind-generated, therefore not objectively real. But still, they have a quality of objective existence, with respect to the Social Self. Memories can be accurate or inaccurate. Dreams are things to be marveled at and interpreted.
Imagination comes unbidden from somewhere.
Mental phenomena have a quasi-realistic status in ordinary consciousness. It's not always easy to tell, by the standards of the Social Self. The Social Self is the judge, the umpire and the appeals court for what is real in common sense terms. Generative Realism from the point of view of the Social Self is indistinguishable from science and common sense. Both science and common sense are exercises of conceptualization, which only the Social Self can do.