Which natural element was the inspiration for the revolutionary redesign of Japan's Shinkansen bullet train, resulting in a more energy-efficient and quieter product?

Product design inspired by nature, known as biophilic design, is transforming how we create sustainable and appealing products in the natural world industry. This approach incorporates natural elements, patterns, and materials to create products that not only minimize environmental impact but also enhance human well-being through our innate connection to nature. Test your knowledge about this innovative intersection of nature and product development!

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Kingfisher bird's beak
Lotus flower's water-repellent surface
Spider web's tensile strength
Termite mound's ventilation system