Abstract
This contribution reports on an ongoing teaching experiment based on Oliver Byrne’s edition of Euclid’s Elements in colors. Byrne’s idea was to present Euclid’s statements, constructions and even proofs with a simple and (in a certain sense) rigorous use of colors, as a way for synthesizing more explicit verbal descriptions and argumentations. In our experiment, developed in two classes of grade 10 students, Byrne’s idea is combined with the use of a free dynamic geometry environment, Geogebra. Interactive Geogebra applets in Byrne’s style are created both by the teachers and by the students and used as a tool for exploration of properties and mathematical discussions; they are also used as a tool for making explicit students’ understanding and learning of Euclidean geometry.