Colour is seen as a means of creating emotions and adding colour to life. Colour affects our perception of the environment, its dimensions but also its colour temperature. Colour can influence behaviour (colour psychology): there are colours that promote sleep, concentration, appetite, conviviality…. In residential environments, colour is fundamental for how we perceive areas, rendering a welcoming atmosphere and enticing users into certain activities, like rest, study, conviviality, lunch etc. In commercial environments, colour is used to enhance the product and its perception, in order to best welcome and intrigue customers, encouraging them to enter and stay in a restaurant. In tertiary environments, as well as in schools, colour is used to increase visual comfort and improve concentration and productivity. Finally, in religious environments, colour takes on a mystical and symbolic role, capable of enhancing space and facilitating recollection. The study also aims to verify whether it is necessary to correct any potential problems in the area (it appears too low or high, wide or narrow, it is dark or too bright, it is abundant in furnishings or is bare); something that can often be resolved by playing with the shades and colour combinations. The study takes into account the natural light that enters rooms, distinguishing whether it is warm afternoon or cold morning light, and it calibrates the colours of surfaces by considering the elements present ( fixtures, floors, furnishings, fabrics, etc.). The study is just like a chromatic path that combines different environments considered as a harmonious whole.