Aranka is a mobile unit that can be called home. It's made of wood, metal and glass. It can be located amidst nature. It is designed for 4 people. Aranka can transform rainwater into drinking one, solar and wind energy into electricity. The fireplace creates ambience but also heats sauna. Aranka is equipped with technology to provide comfort, without compromises or leaving a trace in the landscape. Through the IT system, guests can watch the consumption of electricity and water. One can try living in full comfort with limited energy resources. Such experience can change people's behaviour.