I can't recall whether the decision was made to introduce the palantiri in season 2 or not, but either way this is a relevant question: what size are they? I seem to recall the stuff in Unfinished Tales suggesting that the palantiri were of different sizes, at least the ones brought to Middle Earth, and that the one on Amon Sul was huge. But maybe this is one of those things that Tolkien rethought; I can't remember. Do we do that? Do we want big ones, small ones, some as big as Aulë's head?