Quote Originally Posted by Sigma-Astra View Post
That's not entirely true, physical objects can be reproduced. All of those famous paintings you here about? Very few are the originals anymore and only certain museums get to actually have the original pieces. A lot of those pieces are very good reproductions made by some very talented people with a brush.

A lot of art thieves in this day and age will take works from others...and then sell them on places like Amazon.com, RedBubble, Society 6, etc as physical canvas prints. It's not very hard to take a digital picture and print it onto a canvas actually.
Well I meant that in the sense that if you painted 2 pieces of the same thing, there would naturally be slight variations between the 2. At least moreso than a piece of digital art which is easily copied. I was trying to excluded digital pictures of artwork in this question. But either way, yes there is a market for both fake/duplicate art and authentication of original art so maybe it wasn't a well thought out question.