How to evaluate those black and white photos in the photo exhibition?

Because the black-and-white filter can hide everything in the light, a photo, originally in color, is not so satisfactory, but switching to black-and-white mode becomes so beautiful and emotional, as if there are endless stories in it. Black and white can also bring people a kind of nostalgia, endless meaning, stories and endless grief! Sometimes simple black and white tones can often give people the biggest shock. Compared with those color photos, black and white photos can make us feel another kind of quiet power in the world more quietly. They are really more attractive than color works. I always feel that there are many stories behind these works to be explored.