My two cents: Touch the Brightest Star
The most unique thing about this book, aside from the great writing, is the use of terminology usually reserved for digital reading. The author invites young readers to "swipe" and "tap" various scenes of serene watercolor-like mixed-media illustrations on big bold pages of blue and darkening sky. The change in the shadowing of the apple tree lends further discussion opportunities. I think this one is definitely a Caldecott contender!
This is a truly stellar learning tool and should be purchased for all pre-school and kindergarten libraries.