Duolingo is today the most popular app when it comes to language learning. Gamification plays a major role in increasing the motivation of Duolingo's users. Duolingo has a strong graphic identity that has been developed over the past ten years and in this paper, I investigate how they with the help of colour and shape that help the gamification elements to strengthen the motivation of the user. Because there are so many different gamification elements in Duolingo, it is the "skill-tree" and the app's front page that are the focus of the analysis. The results show that Duolingo has a very well thought out design that is simple but powerful with a lot of symbolism that originates from ancient cultures where the symbolism from both icons and colours has wide meanings and can be decoded by people from many different cultures and backgrounds.