And yet, one of them a real van Gogh?

[Seriy]

and what, in essence, is the difference? what it affects?
People know that Van Gogh - is a hyphen, coloristic glare, lemon-yellow, ocher ... The creator of this style, t e Van Gogh could not itself alter the work in accordance with their ideas, or could do it someone else, from this work is no less vangogovskoy.
From the standpoint of art, nothing changes, even if instead of the Mona Lisa to hang up now, it's a paper reproduction. It's like a mathematical problem, if it is solved, then repeat the solution can anyone and everyone get the same answer.
All answers will be equally true.