Gestalt principles

Gestalt psychology (Wikipedia)

Gestalt principles

Design principles – visual perception and the principles of Gestalt

Gestalt principles of form perception

Gestalt theory of visual perception

Cognitive psychology for UX – 7 Gestalt principles of visual perception

Gestalt principles (Scholarpedia)

Using Gestalt principles for natural interactions

Simplicity, symmetry and more – Gestalt theory and the design principles it gave birth to