Typographic interpretation of the saying 'it's only once in a blue moon'.
The saying is often used by people to justify their actions and comfort themselves in situations like breaking a good habit. Therefore the saying can paradoxally allude to the reocurrence of an event as well as a lack
of will power. The solution for the poster is based on a calendar indicating the number of 'blue moons' throughout the year and therefore reflecting the lack of the person's willpower throughout the year in accordance to different months.