That space between two facing pages is a gutter. Normally this is blank space; however, in some page layouts photos or text may fill and extend across the space. That is a gutter jump.
How To Do Gutter Jumps
There are good and not-so-good ways to jump the gutter when you lay out a spread. It is easier to avoid misalignment during printing or binding, color shifts, and the loss of some text or images into the gutter when the gutter jump occurs on a center spread. When you do cross the gutter make sure that the gutter doesn't split the image in some odd way. A crease down the middle of someone's face or some other vocal point detracts from the image and the layout. Place less important elements directly in the gutter. If possible, place text so that the gutter falls in a natural space between words.
How Crossovers/Gutter Jumps Are Printed and Bound describes and illustrates how images that are split and printed separately (or on opposite sides of the press sheet) come together to create a visually seamless crossover.
"Gutter Jump" for photos across 2-page spread is user question and answer specifically for Adobe InDesign.
Alex Richards On Design: Double Page Spreads provides some commentary on two ways to do a layout that includes elements that cross the gutter.
46 Creative Magazine Spread Design Layout Ideas includes many spreads that have gutter jumps.
- 20 Inspiring Magazine Layout Designs to Checkout has some with text or images that span the gutter.
Also Known As: crossover | double page spread | bridge