This final paper explains the connection of living space with its natural environment in the period of Modern Art, i.e. from early 20th century to the end of World War II. A selection of some of the flagships of world's modern architecture (Villa Savoy, Villa Tugendhat, Villa Mairea, House on Waterfalls, The Farnsworth Mansion, The Glass House, The Eames House) and also of some exceptional creations by Croatian architects (Villa Jakšić, Villa Spitzer, The Round House, Villa Blažeković), works out the theme of amalgamation of man's protected living space with the outside, the latter often being seen as wild and unprotected. Man became to be the centre of planning and design of living space, his more comfortable and happier life became the cause of the start of building in harmony and co-habitation with the nature. A psychological impact of space over man became the basic factor in housing, as being surrounded by natural ambiance meant a happier and a 45 cozier life. Turbulent times despite, new architecture adapted to a modern way of living was born, and has since been often taken as a starting point in design of living space. The significant contribution of modern architecture to the architecture of today is demonstrated in a continuing use of nature as of an outer sheath of the building, which at the same time separates the building from the modern way of living while connecting it with man's primordial urge to enjoy a natural environment.