Monochrome environment is boring, my eyes passed through the room without stopping at all, it seems as if empty.
For others it is the symbol of peace, nothing is dissonant, nothing stands out above the rest, the mind has to work.
I can understand this point of view, still believe in the life of a person as there are moments of sadness, no joy, racking and calm and in those moments when we need a little touch of diversity is out of the monotony that is required except in those small moments.
For example, a refrigerator in the kitchen pink, or red armchairs in the lounge. So I like the monochrome environment.