Which psychological principle did FedEx deliberately incorporate into its logo design that has contributed to its brand success?

Brand identity is crucial in today's competitive market, with logos serving as the visual cornerstone of brand recognition. The most successful logos leverage psychological principles to create lasting impressions on consumers. This trivia question explores a fascinating psychological aspect behind one of the world's most recognized logo design strategies. Test your knowledge about the intersection of business psychology and visual branding!

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The Gestalt Continuity principle with an arrow created in negative space between the 'E' and 'x'
The Von Restorff effect with its purple and orange color scheme to stand out against competitors
The Serial Position Effect by placing the strongest visual element at the beginning of the logo
The Mere-Exposure Effect by maintaining the same basic logo structure since 1971