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Personal Informatics systems allow users to self-track a variety of states and behaviors. However, not all these data are suitable to be automatically collected. This is especially true for emotions and mood. These data require to be self-reported by the users and this activity can be very cumbersome, requiring an high compliance to be effective: instead users often fail in reporting their data due to forgetfulness, lack of time and motivation. To overcome these problems, we propose to exploit Tangible User Interface for relieving the task of self-reporting. In particular, we present a Personal Informatics Tangible Interface able to support users in self-reporting their mood. This solution allows the collection of emotional states in an amusing, simple and appealing way by means of a physical object.