2a: One problem that has recently reared it's head is how to refer to pieces of exhibits that are replicas of real, historic artifacts. For example we currently have a real hunk of the Berlin Wall on display. It's very small and does not give any sense of what the wall was or how big it was. Near it is an exhibition element that is a recreated section, much bigger, with all the graffiti the original had. What do you call it? Although technically an "artifact" since it was man-made, there must be a distinction between it and the "real artifact" not only for our own purpose, but, more importantly, for the public.  As far as I know that discussion continues, but then I am an educator and do not read the literature for curator or collections managers.