An image(Apologies to Wallace Stevens.)
Or the apparition
I recall that Ashbery's Self Portait in a Convex Mirror delves into the self and the image of the self but that is a whole other world of exploration that goes into philosophy also... but I will limit myself to the Imagists and the Impressionists for now. Both capture an image. .a moment. ..but it isn't the present. .it is a presence that lingers in the mind. Recollections of a past remembered. Proustian nostalgia for a moment passed.