Proximity Bias

How do you stand out in a sea of sameness? How about getting closer to someone or something! Our brains are hot-wired to find patterns, and one of those patterns is proximity to objects. The closer an element is to another, the more likely we are to associate those two elements together. This is a helpful design tool, and explains why people can't, for example, find light switches to rooms - because they are typically too far away from the entrance of a room, so we don't associate them together. Keep things close and let your beautiful pattern-matching brain find the link. Its there.
Taken from

"Proximity - Lidwell, William; Holden, Kritina; Butler, Jill. Universal Principles of Design, Revised and Updated: 125 Ways to Enhance Usability, Influence Perception, Increase Appeal, Make Better Design Decisions, and Teach through Design (p. 196). Rockport Publishers. Kindle Edition."