Put an entire universe of fantasies in the framework of one room is always a very interesting and very difficult task. After all, this universe has no boundaries. In the design of children's rooms, there is always a need to expand space, not only visually, but also mentally. We want to give two examples of design of children's rooms within the framework of the project of one house. Both rooms are full of decor and clearly express such moments as age, sex of children and their hobbies. Improvisations with furniture arrangement, accents of lighting, selection of color palette and maximum ergonomics. Behind these serious moments is a complex work on designing interior designer Katrina Antonovich. To get the ideal, most comfortable and so charming interior, the designer uses all the achievements of technology, the best materials. As for the children's rooms, there is a study of child psychology in the work. Only in this way can we create a truly ideal world for a child, in which the journey to adulthood will be filled with happiness, comfort and warmth of home comfort.Put an entire universe of fantasies in the framework of one room is always a very interesting and very difficult task. After all, this universe has no boundaries. In the design of children's rooms, there is always a need to expand space, not only visually, but also mentally. We want to give two examples of design of children's rooms within the framework of the project of one house. Both rooms are full of decor and clearly express such moments as age, sex of children and their hobbies. Improvisations with furniture arrangement, accents of lighting, selection of color palette and maximum ergonomics. Behind these serious moments is a complex work on designing interior designer Katrina Antonovich. To get the ideal, most comfortable and so charming interior, the designer uses all the achievements of technology, the best materials. As for the children's rooms, there is a study of child psychology in the work. Only in this way can we create a truly ideal world for a child, in which the journey to adulthood will be filled with happiness, comfort and warmth of home comfort.