tlwDNwTuQltn8rgvJwzLdt2PI1YN16QcWJbZBN6wxg9rhYYmf1ipBxy04Q0T2M8/FPneGpeOAdalZLxq1kGyxGwLwtfaJZsAERfc1U23HT7KfuUQFquNfWf85vFmVbu7W09PuNjWBdP/bCb4rLJg1XlKNWe7s4n7WcCMKtLdAdnuMye6dLysMozVZxpY77tyBRnpitwLVT8WGBKBM/hPz2JQqSqX4WZp. Colour wheels as symbols of engineering and design