Ideas are free developments, and only their materialization can be monopolized.
Here is a proof. Above the door of the toilets of a psychiatric hospital, Gautel affixed the word Paradis (“paradise”), in gold letters.
Bettina Rheims took a picture of it, made a triptych, sold it and reproduced it, without the agreement of the German artist! On XXX, the High Court ruled that the work of Gautel, consisting in affixing a word in a particular place with a diverted sense, is protected by copyright law.