It's barely a concept.

I listened to the Guardians of the Galaxy director's commentary for the first time today and it was really delightful. James Gunn is just such a huge fan of his own movie! I love how basically everyone who worked on the movie at all is his best friend and/or brother, either because he cast them because they were already friends (or brothers) or because they became friends working on this movie. He also talks a lot about the worldbuilding and design, which he took really seriously. Really interesting all around.