Something is art, dance, story, poetry or music when I feel and think it so. I, you, we, make art into being. Take these words, a single line poem: I dream two love.
That these words are intriguing does not define them as poetry. It is the word 'two' that changes what would otherwise seem a simple statement into something more, something of significance that can be returned to and pondered on.
That a single letter may change something into art is magical.