Even modern weatherproof padlocks often keep this feature. Rubber coatings and improved seals help block moisture, but engineers still include the small hole as a pressure release point and backup drainage channel. It’s a timeless design choice that continues to prove useful.
Once you understand this hidden feature, it becomes easier to appreciate the subtle details built into other everyday items. A screwdriver, for example, may have a square or hexagonal handle base designed to fit inside a wrench, allowing extra torque for tight or awkward spaces.
Clothing also carries small, meaningful design elements. The fabric swatch attached to new garments once helped stores match patterns and colors before digital catalogs existed. Shoppers used it to test detergents or check fabric reactions without damaging the clothing.
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