Designers work with text, images, headlines and other placed on a screen. Developers transform them into tags. This is basic of layout creating. To make sense from layout there is a law:
Objects that are close to each other, tend to be persived as connected
Humans and distances between them and objects can help to illustrate it.
Guys are looking at iPhone in the store:
And here it’s clear whe is the owner:
A particular case of proximity law is rule of inner and outer space.