This phrase means that although people have been creating art for a long time, much more art is going to come in the future. Art is just in its initial stages, and there is still much more to come. It implies that art is constantly evolving and growing, so what we have today is only the beginning of what art is going to be. Furthermore, it suggests that even more creativity and imagination is needed in the future to continue pushing boundaries and inventing new forms and styles of art.