Imagine and depict a white balloon with a string attached, arranged in a way that resembles the number "9". The balloon should be inflated and floating, with the string hanging down to form the curved portion of the numeral. The balloon itself can serve as the circular shape of the "9". Pay attention to the details of the string, ensuring it curves gracefully to create the form of the number. Consider adding subtle shadows and highlights to enhance the three-dimensional effect of the balloon and string. This artwork should offer a playful and creative interpretation of the number "9", inviting viewers to appreciate its whimsical charm.