The process of reading (whether the book is digital or paper) is interactive. As we read, we make guesses and draw conclusions, work out implications and connect what we already know to what we're reading. One of the things I watch out for when I'm writing is to not over-explain or over-describe, so the reader has some space to bring their own experiences to the story.
Earlier this week, Patricia C.Wrede, author of The Thirteenth Child, discussed how you can make a strong impact in your writing by allowing the reader to fill in some of the missing details:
"...if the writer provides a few of the right visual details, plus some sounds, smells, and sensations, plus the viewpoint character’s reaction, the reader will generally fill in what’s missing with his/her own details…and the resulting image will be more powerful because it’s tailored to fit each reader by the readers themselves."
Patricia C. Wrede, Making an Impact.