My thoughts on the issue are that spirits/angels etc exist on another plane and that maybe their "shadows" could be captured but that we have limited ability to make any sense of it. It would be like a 2 dimensional drawn stick man somehow trying to describe a 3D man to his friends... or make sense of a 3D world. Impossible. I think this is one of the reasons Heaven is indescribable. There is not the language to describe such a concept. I think that when we become spiritual beings we will increase in dimension somehow... that is why they say The Holy Trinity... because God can exist is several forms: man (Jesus/Buddha for eg.) spirit and divine entity at once. So human existence will be a part of our spiritual existence but it will only be one facet... it's like a square is a part of a cube... but only one facet... a cube is a square times eight. So, coming back to your original question Soul, i think that sometimes shadows are cast, perhaps in photos but they might not have much bearing on the actual spirit who, I think, is beyond our comprehension... but still worthy of contemplation. Just my thoughts