This article proposes a comprehensive AI curriculum tailored for young learners aged 11 to 14, emphasizing a humanistic approach. We review other AI curricula proposals for children and young people and underline that they focus primarily on AI's technological benefits and on learning coding and logic. Our curriculum explores human cognition that is often overlooked in existing AI curriculum. Our proposal combines learning through construction, reflective discussions and project-based learning in order to approach AI from variety of angles. Implemented by CreaTIC Academy during 2023/24 school year as an out-of-school activity in a secondary (middle) school in Barcelona, Spain, this curriculum integrates technological, philosophical, cognitive, and cultural dimensions. It draws from diverse fields, including Philosophy of Mind, Cognitive Psychology and Philosophy of Children, and includes practical coding with tools like Scratch and AppInventor, as well as Machine Learning for Kids. Designed to be adaptable across various socio-economic contexts, our approach aims to promote a broader liberal education for children and help teachers implement AI activities in their classrooms.