In front of my eyes. It's sort of like returning with my eyes closed to a spot where I once stood, opening my eyes for a quarter-second, and closing them again. Or like somebody briefly holding up a post-card in front of my face. The image quickly fades.
That seems so different to my own experiences. I think I can visualize fairly easily and it's very much a 'mental' thing, distinct from 'seeing'. If I had to describe the location it would probably be a few inches behind the eyes with a sensation not dissimilar to mulling over a problem.
