A two-page spread is a single, wide illustration that stretches across two facing pages, the left and the right, as one big scene. It is the picture-book moment where the art opens up and fills the whole opening.
When to use one
Spreads are perfect for the big beats of your story: the reveal, the sweeping landscape, the moment you want a child to linger on. Because they are so wide, landscape page shapes suit them especially well, though any shape can carry a spread. Save them for the pages that deserve extra room to breathe.
One generation, one charge
Here is the part worth knowing: a spread is a single illustration, not two. It is made in one generation and it costs one charge, even though it lands across two pages. So a grand double-page scene is no more expensive than a single-page one. You get the drama without paying double.
How it sits in the book
The two facing pages are linked as one spread, so the art lines up cleanly across the middle. You still write and place your words on the pages as usual. It simply looks and prints as one continuous picture across the opening.
Spreads pull in your cast and style through the World just like any other page, so your characters stay themselves across the whole wide scene.