Yang is characterized by the circle. Yin by the right angle. Yang is the closed circle, Yin is the open angle. Yang is clockwise, Yin counter-clockwise. Yang is hard, resistant and tense, Yin is soft, yielding and relaxed.
Creativity is used here in the largest sense of the word.
It refers to a free and spontaneous state where life itself is created and self organized in new and intelligent ways. It does not just refer to the creation of objects of art. The Chinese understood the whole of life as the proper field of creativity, not just ceramics, music, books and paintings, but also drinking tea and archery. Everything we do can be an art. Everything can be infused with creativity and beauty.