Psychotherapist, Donald Winnicott (1896-1971), said that creativity was essential for us to become fully alive and to nourish our mental health. He also linked creativity to playfulness, saying that a child's play was about the making of a potential space, or, as I would argue, a space for potential.
It's difficult to remain playful. So much encroaches. Daily tasks and worries (especially around making enough money to live on). The "what am I doing this for"s and "is this good enough"s? The sense of fun oozes away.
On a comedy quiz show someone made a self-deprecating joke about how his art was at the level of colouring in books. But why should this be funny? Why do we have to leave colouring books behind when we step into our teens?