In recent years, there are more and more opportunities for the active participation of users in design. In the dissertation, we study how an alternating construction system can meet the basic daily needs of a user, involving him in the process of designing his space. We observed daily human actions together with the objects they use, both in private and public environments. We analyzed the physical heights at which these actions happen and developed a construction on a 1:1 scale, which after being multiplied by specific constants, results in 3 basic levels of actions.  Those levels are split into those of the seat, the desk, and the eye. The basic structure of the system is based on a single neutral unit. Our goal was to build a set of rules which, when used together, can bring value to the user by defining the space around him. We arrived at the design of a single system that lets users create and edit complex structures with ease. This system “grows” and evolves together with the person, whose experiences and habits have a direct connection to the layout and functions of resulting structures. Acting as potential users, while using the toolbox, we created examples of such structures and gave them various functions.