We implemented a controller in a form of a dollhouse and toy household appliances. Small children can operate actual household appliances in their environment with the controller. When children touch a NFC tag attached to a toy house appliance in a dollhouse, the corresponding actual household appliance is operated via Wi-Fi router. The dollhouse is nested in the smart house and it provides feedback from the toy home appliances to the actual home appliances. Thus, in terms of the feedback and the recursive structure, our proposed interface might nurture children's cognitive development through usage of the interface.