Almost everyone has a common sense: black is thin. So does anyone know why? Here's an explanation:

I. Scientific principles

German physicist Herman called this illusion radiation illusion, which means that in a dark background, the higher the brightness, the bigger the object looks.

Which circle looks bigger, it is obviously a white circle with a black background. In fact, this is just an illusion, and the four circles are the same size. Scientists explained that bright stimuli can make neurons produce nonlinear amplification, making the stimuli look bigger than the real thing, and the white circles are brighter, so they look bigger.

White or light-colored objects have strong reflective brightness and expansive exudation under black or dark background. This phenomenon is called optical infiltration, and the illusion caused by optical infiltration is called optical infiltration illusion.

Second, color illusion.

The contraction and expansion of color in the color system, the expansion color refers to those colors with high brightness, high brightness and warm tone; In achromatic colors, it refers to white and light gray. In the color system, the color with shrinkage refers to the color with low brightness, low purity and cold tone; In achromatic colors, it refers to black and dark gray.

Color also has its sense of weight. Bright colors will give people a bright and light feeling, such as white and light gray; Colors with low lightness will give people a heavy feeling, such as black and dark gray.

"Weight sense" and "slimming" are actually similar concepts. In addition to its own sense of contraction, black also has a sense of weight, which will make you look "heavy". In other words, black doesn't really make you look "slim", but it will make others mistakenly think that your "weight" looks heavier than your actual weight.

Conclusion: So, color can't really make you look "slim", but the significance of color is that the color that really suits you will make your head and face look radiant, make your skin color bright, make your facial features more three-dimensional, fade spots and fine lines, and so on.