They say that on average, we spend about 90% of our lives indoors. Therefore, the protagonist of the conversation will be the enigma of the K coefficient, that intangible value that makes us feel good, physically, socially and emotionally in a place. We will try to decipher it, putting on the table, in addition to the tangible elements, other parameters such as the ability to play, dreaming, the feeling of belonging or spontaneity when creating interiors that induce well-being.