Hierarchy

Hierarchy is the choreography of content in a composition to communicate information and convey meaning. Visual hierarchy directs viewers to the most important information first, and identifies navigation through secondary content.

— @nickbabich http://bit.ly/2eQSMho

Designers use elements such as contrast, repetition, alignment, proximity (C.R.A.P.) as well as size, color, shape, orientation, to create a cohesive visual language and establish hierarchy.