Visual composition depends on how people group, prioritize, and interpret elements. Gestalt principles such as proximity, similarity, continuity, closure, and figure-ground separation remain foundational because they describe robust perceptual tendencies. Contemporary research extends these principles using attention models, eye-tracking, computational saliency, and cognitive load theory.

In documents and interfaces, hierarchy directs attention through scale, weight, contrast, alignment, repetition, and rhythm. A strong hierarchy reduces search costs and improves comprehension. At research level, hierarchy can be modeled as a measurable pattern of salience and task relevance rather than as a purely aesthetic quality.

Research often operationalizes outcomes such as reading speed, error rate, recall, scan paths, fixation duration, or subjective workload. If a layout change improves task performance, one may hypothesize that it reduced cognitive load. However, causal claims should be supported by controlled studies and careful interpretation.