This has stirred all sorts of thoughts, nice discussion.
The subject of Art being made by Artists, and functional stuff being not Art, made me think of Alfred Wallis, who was a Cornish fisherman turned artist. He painted pictures of what he could see and what he remembered from his life as a fisherman. I don't see any meaningful distinction between his "works", which are regarded as Art - it's in the Tate, so it must be :-) - and a hunter sitting down to paint a horse on a wall or carve a reindeer out of a bone.
As Rhiannon says, both require use of observation, etc, and both may well be fired by a similar human impulse to record or to represent things in a way that has form and permanence.
Wallis said his subjects showed "what use To Bee out of my memery what we may never see again..." and another St Ives artist, Ben Nicholson, said that 'to Wallis, his paintings were never paintings but actual events'.
[Thanks to Wiki for those quotes]