"A line is a thing that has a practical or purposeful significance just as much as a chair, a fountain, a knife, a book, etc. And in this last example, this thing is employed as a purely pictorial means without those other aspects which it may otherwise possess i.e. for the sake of its pure, iinner sound. If, therefore, a line is freed from the purpose of indicating an object, and itself functions as a thing, its inner sound is not weakened by being forced to play an incidental role, and assunes its full inner power." - Kandinsky

a presence invoked by means of an absence