The personality characteristics of sanguine and choleric people make them ardent lovers of an active and feverish lifestyle unless situations become extremely serious to completely preoccupy them. The ambition of choleric people makes them more serious than sanguine, but their activity and dynamism manifested through the inherent impulsiveness creates inconsistencies with their systematic or goal-oriented tasks. However, sanguines and cholerics are not conservative or retrograde in nature. This is the reason why bold stylistic solutions ranging from hi-tech Urbanism to avant-garde eclecticism has been recommended for them. Interiors with vast open space and maximum flexibility in planning provide the harmonising role with the sanguine personality. Warm and light colours like the soft shades of yellow or orange colours are generally recommended to create the variations in furnishing and decoration. Compact modular furniture with elegant design suits the personality of sanguines and cholerics. Surprisingly, the stimulating effects of interior design can be strong enough to change rather steady temperament of sanguine to choleric or even slow paced phlegmatic personality and vice versa. The contrasting colour like terracotta is recommended for sanguines’ room decoration to create harmony with saturated red or black colour, which are their favourites.

Glass and nickel-clad steel furniture enhance the stimulating effects of interior design for sanguines and cholerics. The furniture of nickel-clad steel allows the architects to shift the main colour palette to its colder spectrum and impart ever-young classic style of the entire premises. The interiors in its purest form are not recommended for a choleric personality regardless of the need to harmonise their bursting temperament. The stimulating effects of interiors for excessively excitable psyche of choleric personalities are achieved by using the same principles of softening interiors as applied in the case of a sanguine person. However, more expressive colour patterns are used for cholerics.

The personality traits of phlegmatics and melancholics are totally different from sanguines and cholerics. The drives for stability, calmness, and the protection form dynamic changes or outside world defines their lives credo. In terms of psychology, phlegmatics are desperate conservatives by nature and try to sustain the established norms as a protection from radical changes while melancholics are complete introverts, detached from the outside world. If they are allowed to organise or decorate the living space according to their inherent personality, a phlegmatic’s interior will create the impression of an antique shop while a melancholic’s house will remind you the studio of a creative artist. These inherent personality characteristics help the architects to design interiors that incorporate both harmonising and stimulating aspects of interior design. Dimmed pale or dark shades with original textures and ornament decorations dominate the recommended interiors that are designed for melancholic people. The stimulating effects of interiors can be achieved by introducing warmer and live colours to the main colour palette. Decorating the room with a little eclecticism also adds to the stimulating effects.

Finally, designing the interiors with a psychological perspective becomes more challenging when the architects have to design for people with mixed temperament. They have to determine which emotional characteristics have to be activated or reduced for achieving the desired stimulations. However, in most of the cases, there is no need to drastically change the house planning to achieve the results. A part of the house like the working space can be redesigned to achieve the stimulating effects while the space used for rest and recreation (bedroom or Living room) can be remodelled to bring harmony with the personal characteristics of the individual.