This wasn't the last time Miyamoto discussed the origins of Mario's iconic pipes. In 2009, he said in an Iwata Asks interview ...

The big green warp pipes populating Mario's world are just an accepted feature at this point, but have you ever wondered where they first came from? According to an old interview with series creator ...

The big green warp pipes populating Mario's world are just ... to consider how to connect the bottom of the screen back to the top, since they needed to have the enemies re-appear there.