Gestalt principles are rules of visual perception developed by German psychologists in the 1920s. They describe how the brain automatically organizes visual information into patterns and groups. The core principles relevant to landing pages: proximity (things close together seem related), similarity (things that look alike seem grouped), closure (the brain completes incomplete shapes), and continuity (the eye follows smooth lines and curves).
Every layout decision you make either uses or violates these principles. When your pricing cards have uneven spacing, users subconsciously read the closer ones as a group and the distant one as separate. When three feature icons are blue and one is green, the green one feels different even before anyone reads the text. These aren't design opinions — they're perceptual facts.
Applying Gestalt to landing pages
The most violated principle is proximity. We audit pages daily where the heading for a section is closer to the content above it than to its own content below. The brain assigns that heading to the wrong section. Fix: ensure headings have more space above than below — typically 2x the bottom spacing.
Similarity matters for CTAs: if your primary and secondary buttons use the same styling, users process them as equivalent options. Your primary CTA needs visual distinction — not just different text, but visibly different weight, color, and size. The Gestalt principle of similarity means "looks the same = is the same" in the user's mind.