The best example of this in UX design is the use of cards. It is very clear in this image which information is grouped together. 

University of Michigan - Ann Arbor

The law of common region states that when objects are located within the same closed region, we perceive them as being grouped together. This is very similar to the law of proximity, however it happens in a closed area. 

The Law of Common-Region

"What are Gestalt Principles?" Interaction Design. https://www.interaction-design.org/literature/topics/gestalt-principles

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