Cover cables in the corner?

[Saaben16]

Hi! What is the best solution for hiding these cables in a corner?
I'm considering some type of box, but what is the best way to build it and in what material? Or is there another smart solution?
The wall is curved at the top towards the ceiling..

 

[FemTummar]

Now, I don't know what the rest of the room looks like, but I would probably consider making a custom-built corner shelf that goes up to the ceiling and let the top part function as the box you mentioned. That way, it becomes a piece of furniture and not a makeshift solution.

 

[Saaben16]

There is a door right under…

 

[Stefan N]

Why don't you make a small box with a corresponding rounding towards the ceiling? It can be done fairly discreetly.