There was a famous artist who got brain damage. Afterwards he could only see grayscale. He also started disliking colors. Couldn't actually see the color but h

There was a famous artist who got brain damage. Afterwards he could only see grayscale. He also started disliking colors. Couldn't actually see the color but he thought they looked "dirty and weird". So that's a possible cause for the popularity of gray. Brain damage. Caused by ubiquitous use of antidepressants or bad air or whatever.