"Dashboard elements accompanied by superfluous graphics make visual search more difficult (left). Dashboard elements without unnecessary icons make the numerical data more visually salient (right)."

University of Michigan - Ann Arbor

The UI of a complex application can have much information present on screen at once. As such, designers need to distinguish the most important information by having it be visually salient to the users, This can mean not only adding weight to a UI element, but also by removing non-essential elements from nearby. 

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