Very beautiful lamp with difficulties during installation

The lamp on the wall looks really great. The light is very nice passively scattered on the wall to the top and bottom of the wall and not hidden.
Since the lamp from Gibs is it can happen that way remain residue to the wall and their hands after touching are very dusty.
What I did not like was the assembly. At the back holes 2 are fastened with screws on which one the lamp to the wall. Since the lamp is very narrow, you have to have a really very short screwdriver and even then it's a fiddly job purely turn the screws. (Screws and dowels are also not included)