Richard LeBlanc looks into the planes of existence for the 600th post on his Save Vs. Dragon blog, exploring some of the literature that existed long before Dungeons & Dragons started using it. As early as Dragon Issue 8, Gary was starting to develop the idea of the planes for the game. The planes became something that ended up getting further consolidated in the game through the different iterations of Dungeons & Dragons, especially through the 3.5 and 4th editions. Gary continued to develop his ideas of planes though, making them more and more complicated, and presented a new version of this in his Dangerous Journeys products, which covers multidimensional travel. Planes are one of those things that can add a lot of fun to a game, or allow for a completely different type of play than normal, which can be a refreshing change.