Instead of its aesthetic value, what a piece of artwork like this can do to you? Besides can be a sort of income for the makers/artists and the art traders alone, it does also stimulating the brains of each observer like you and me.
Every single earthling should be familiar with this piece of work, especially those graduated art scholar and artsy fartsy wannabe out there. If you haven't, please blame on our educational system and the lack of exploration of yours. Those ‘who are up there’ have successfully restricted people's creativity and instinct. And mind our own ignorance too.
Go figure it out and do remember; back to the basic and do explore the fundamental first before talking out loud your ideas, you artsy people!