The document discusses the use of posters as an educational tool in special secondary education in Greece. It provides examples of how posters have been used to teach concepts like hand washing sequences, Makaton signs, and dealing with anger. The author notes that posters are a visual aid that can be adapted to students' special education needs and incorporated into many lesson plans. Several examples are given of posters created to teach science concepts through hands-on activities using low-cost materials and an inquiry-based approach.