A slightly belated festive question!
Why do we write on the right hand side of cards (and books)?
In English and many other languages, we typically begin writing in the top left and move rightwards and downwards, row by row.
However, when writing a card (Christmas, birthday, etc.), we write our message on the right-hand page. In fact, I frequently see a message beginning on the right-hand page and continuing on the left-hand if it is too long for a single page. This would be bizarre and counter-intuitive if I weren't already used to it.
As far as I'm aware, the same thing holds for books - The first page of the first chapter of a novel seems to always be on the right-hand page.
Is it because the right-hand page is the first one sees after opening the cover of the card or book? Or is there some other reason for this convention?