Law of Proximity

Objects that are near, or proximate to each other, tend to be grouped together.Gestalt laws of groupingGestalt laws of grouping
Elements tend to be perceived into groups if they are sharing an area with a clearly defined boundary. A Common region can be created by defining a background behind an element or grouping of eleme....

Source

• Proximity Principle in Visual Design, NMGroup
• The Psychology Principles Every UI/UX Designer Needs to Know, Medium Post
• Design Principles: Visual Perception And The Principles Of Gestalt, Smashing Mag