The charge carriers were proposed to reside in the large body-centered voids within the Prussian blue framework since the emergence of the earliest structure model by Keggin and Miles in 1936. Recent research on the other hand suggests that all cations independent of size try to stay in or as close to the face-centered sites as size allows and uniformly display an aversion to the body-centered void. These suggestions are accompanied by claims that the main transport pathway throughout the cubic Prussian blue framework is not the hopping of charge carriers from body-centered void to body-centered void. Instead charge carriers prefer to move along the cyanide grid in what the authors call a ladder mechanism -always staying close to a face-centered site and revolving around an iron atom towards the next face-centered site while avoiding the body-centered voids.