You’re writing a novel and putting a lot of images, events, characters, settings, and objects into it. Grand! A lot of manuscripts don’t take the necessary step after this, however, and connect the dots. If you introduce a character early on, they should work their way deeper and deeper into the fabric of your plot. Images should reappear and gain significance each time. A bird in chapter one will ideally have new shades of meaning halfway through the book, and then even more in the final chapter. Settings should change as the plot unfolds, meaning that the quarry your protagonist runs away to on a carefree summer day might change drastically when she takes a boyfriend there at night. Not only might your character experience these images, events, places, and people, you should keep in mind how your protagonist reacts to them.
Imagine a photograph of two people you’ve never seen before, young girls playing table tennis. To a random stranger, this elicits little or no reaction. But imagine if you were the girls’ mother, looking at the photograph? Or one of the girls, but maybe thirty years down the line? That object has now become imbued with some very personal emotions. Give the important secondary elements of your manuscript significance by building a relationship between them and your main character. These relationships can change and evolve over time.
Mimic the human brain and don’t let your characters think linearly. This means that you shouldn’t just bring an important secondary element to the page when it’s convenient or right when it’s needed. In between encounters with that bird that keeps reappearing or a character who is crucial to the plot, let your main character remember them or wonder about them. That’s too convenient, and it plays on the surface. Free yourself from only referencing one of your carefully chosen story points when it’s needed and let them form a richer tapestry using your character’s inner life.