Arduino is a free, opensource hardware platform that can be reprogrammed with a piece of opensource software. Software that reprograms hardware allows people to transform the way they understand and interact with the world because electronics are omnipresent in our everyday activities. Elevators run with microcontrollers, in an average car there are seventy microcontrollers and even a microwave oven has microcontrollers. The goal of Arduino is to empower people other than engineers to understand interaction paradigms such as physical, tangible and ubiquitous computing and to create their own interactive artifacts with digital electronics. Eventually, it democratizes learning by practical experimentation so that learners discover how to be independent, how to use things by themselves, how to exploit those things to build interactive systems by themselves and how to be critically demanding about technology. In this talk, I will introduce the feature that makes a free hardware platform such as Arduino a powerful learning tool that foster creativity and I will talk about a vision for the computing education for the 21st century: accessible and pleasant approaches to teach kids how to reprogram the surrounding environment. To this end, I will share experiences and insights gathered from project-based learning experiments with Arduino in secondary schools.