It is a message of support about 'being honest about one's desire through life', not being swept away by majority and so called 'the standard'. At the same time, it is a story about being oneself in journey of following one's own desire.
A story of a square who longs to be a circle after witnessing it bouncing away. At first, it tries to imitate the circle. But after several trials, it gradually finds its own way of flying - the square folds itself as an aeroplane and finally flies up to the sky. It has found freedom in being oneself.