Most of the apps are landscape or are better in landscape (e.g. YouTube) so the decision may not be as natural as it seems at first glance.
Another thing to consider, though, is that a high proportion of books for under 3s are in landscape too (in my experience at least). So maybe the book industry has also had this question crop up over the years too.. :-)
Another thing to consider, though, is that a high proportion of books for under 3s are in landscape too (in my experience at least). So maybe the book industry has also had this question crop up over the years too.. :-)