>>8259087>>8259120As far as I can tell, before 2007 the only "island" inside of the robot was Metru Nui, which lay flat inside a cavity in Mata Nui's head (because it's supposed to be like the robot's circuit board) surrounded by a sea of liquid protodermis (because it's also supposed to be like Mata Nui's brain-the sea is the cerebrospinal fluid).
Mata Nui (the island) was generated on top of Mata Nui (the robot's) face, as you know, and the island of Voya Nui was formed when a "valve" was ejected from the robot's heart/power core (Karda Nui, not an island and never was) when the robot crashed and started leaking molten protodermis fuel, which cooled to form the island (the Matoran of Voya Nui were originally meant to be workers maintaining the valve that made their way to the surface post-cataclysm; Voya Nui the island was never a part of the robot).
However, in 2007 we got the Bionicle World guidebook, which depicted just about every location in the MU as an island like the ones we'd seen in the storyline previously. In Greg's previous work whenever he depicted another "land" in the robot he'd depicted it as being island-like, probably in order to keep the robot secret, but there was always a bit of room for ambiguity (note that Karzahni, the only one of the locations Greg invented himself to be explored in detail prior to late 2006, was explicitly not an island). But for whatever reason (secrecy?) the story team went with "everything's an island like the first three Nuis", even though the islands created by Faber and Advance for the main story were all really just "islands" from a certain point of view: they were machinery that looked like islands, not islands that somehow work like components of a machine despite the fact that they clearly fucking aren't, like the islands from the Bionicle World guidebook.
So now the robot's innards don't make any fucking sense. I love the locations Greg came up with for the guidebook, but they shouldn't have been islands.