I would characterise myself, per your original question, of being able to superimpose imagined objects onto my visual field.
I would not say that such a superimposed red circle is entirely indistinguishable from a real one, but the experience is very much akin to seeing. For one thing maintaining superimposed objects requires a degree of mental focus of which I am constantly aware, especially if the object is detailed and solid.
This feels a bit like "is my red the same as your red?". What do even mean when you say you can "imagine that wall with the red circle on it", but you can't "see" it? Is there no visual aspect to your experience whatsoever? Do you have a spatial sense of the red circle's size and position? Do you experience (hear?) verbal statements about the red circle's existence and properties, or is this some conceptual sense of the red circle that is both non-verbal and non-visual?
I would not say that such a superimposed red circle is entirely indistinguishable from a real one, but the experience is very much akin to seeing. For one thing maintaining superimposed objects requires a degree of mental focus of which I am constantly aware, especially if the object is detailed and solid.
This feels a bit like "is my red the same as your red?". What do even mean when you say you can "imagine that wall with the red circle on it", but you can't "see" it? Is there no visual aspect to your experience whatsoever? Do you have a spatial sense of the red circle's size and position? Do you experience (hear?) verbal statements about the red circle's existence and properties, or is this some conceptual sense of the red circle that is both non-verbal and non-visual?