...you could only see black-and white?

First of all you probably are totally shocked, because you`re used to see a colorful world and environment and suddenly everything became black-and-white.
Let`s imagine a day without colors.

In the morning there`s the problem that you can`t see whether the clothes you decide to wear match or if you look like a parrot. You have to ask another person. On the other side, when you live alone and can`t ask someone, you don`t have to think a long time about your choice, you just put some clothes on and start your black-and-white day.
When you meet a person for the first time and you`re bad at memorizing new people, you can`t help yourself by keeping in mind the hair color or the color of the clothes, you have to watch out for other characteristics.
In my opinion it`s hard when you can`t see any colors, because many things in our everyday life are marked with colors, for example signs and clothes as I just said. You have to be more concentrated most notably when you drive any vehicle. You are used to focus on the color of the light and now you have to check where the light is coming from, whether it`s the first or the third light in the row. That can become really fast dangerous also depending on the daylight.
Especially when you love arts and paintings it can be very sad not to see which colors the artist used, because colors are often important to understand the intention and to interpret the painting. Also when you want to paint it`s the same problem.
Moreover, colors light up the world and can really influence your mood. If you see some fresh and lightening colors you feel happier. When you colored for example one wall of your room and it changes now grey or black for your entire life, just as everything else that was colored in your life - even the eye color - you could get depressed or become just sad.
But at least you can still smell and hear! So maybe it would be an alternative to put some nice smell in your room and to turn on cheerful and danceable music to put you into a good mood. In general you will focus more on other things when you just see black-and-white. The gestures and the mimic of the fellow human beings become more and more important just as the textures of everything and in general all other senses. You will focus more on the lightening and the shape of everything than the color.
How would you imagine yourself in a black-and-white world? How would you react if you couldn`t see colors anymore?