Secondary school ,,Neofit Rilski ‘’ Tvarditsa ,Sliven in Bulgaria is working on a COMENIUS MULTILATERAL SCHOOL PARTNERSHIP project called "UNITED COLOURS IN EUROPE" led by coordinator Nina Zhelezarova. Students at the school are using techniques developed by Edward De Bono to learn English and create art, such as a poster of a Europe tree with experiments using different colors, as they work on the partnership project which aims to bring European countries together under the symbolism of a rainbow and sun.