In my book, nobody has the right to own a trick, a routine, an idea. I strongly oppose the concept "copy rights". It is in the nature of humans to copy everything they see and it's almost everything you do or did in your life if you're a human; that's the way we learn. To think that you are truly original or creative in the purest form of these words is - in my opinion - a little arrogant OR naive.
How does it harm anyone if I copy (steal) an idea from him?
In our society, it can actually harm someone, as people depend on money. If the person whos idea gets copied depends on the money that comes from the fame that he gets from presenting the idea, then, of course, it harms him if I copy his idea and get the fame instead of him. I copy his idea, I steal his fame, I steal his money.
So theres two needed things that lead to the harm of the person whos idea gets copied: 1. The copying of the idea, 2. the dependence on money.
As I have already argued, it lies in the very nature of humans to copy; hence I blame the society that artificially makes people's existence depend on money. To quote @DanielSimu (possibly with skewed context):
I rather live in a world where this issue does not exist, and therefore plan to encourage people to rip off my material as much as possible!.
I say such a world is possible; a relevant subject is basic income.
If there is no money involved in any case, then "ripping off" a trick/idea is the way to go and should be
encouraged, as it serves the trick/idea if it gets spread amongst people. You do not need to "take it one step further" (@instantjuggler), as, by learning the trick, you let the trick live on, and hence give back to the community - maybe you dont give directly back to the originator of the trick, but indirectly.
I have just seen Rejean's version of the triangle and I agree that it's horrible as it's just a butchered version of the original piece; but I wouldn't blame him since I don't think he hurts Micheal Moschen in any way. I actually think he gives a service to the piece of art.
Rejean's comment "haha, you idiot, it was dan menendez who originated the piece." is not only hilarious, but also to the point. The piece of art is independent of the artist.