Projects include: Windmill - Water wheels, developed in the 12th century, changed the way work was completed. Battle Shield - Knights represented the feudal system. Metal was boiled in wax to form a shield with an embossed design. Tournament Flag - Events, such as jousting, were held between castles. Flags with the crests of families or castles were carried to identify the group in tournaments. Heraldry designs identified friends and enemies in battles. Shop Sign - Shop owners developed signs, many embossed in wood, to identify their craft. - Faux Marble Heraldry Journal - Heraldry developed because knights in armor were difficult to recognize as friend or enemy. Families were identified by their coat of arms. 3D Decodere Glasses. .