This document discusses a project called "The Dodecahedron" that was developed in 2003 and implemented in subsequent academic years at a school in Belgium. The project promotes cross-curricular, collaborative learning by having students from different subject areas like history, language, and carpentry work together on projects like writing a story inspired by a dodecahedron object or building a scale model of a Roman villa. The projects are designed to make subjects more interesting for students and encourage skills like teamwork, additional research, and perseverance. They can be easily reproduced by teachers without additional funding by using existing school resources and periods.