Object-oriented programming (OOP) is one of the most prevalent techniques of programming now. OO principles are also widely used in comprehensive software including user graphical interface. Although the benefit of early teaching OO concepts is advisable, it meets variety of difficulties and as a result no general consensus on this subject exists. The present paper by virtue of OOP instruction analysis proposes to include OO foundations as a topic into the school informatics course. The specific of the suggested method lies in a separation of OO principles from learning any concrete programming language like Java or C#: the original software tool was developed for these aims by the author. The tool acquaints pupils with OO concepts during construction from objects their own virtual world.