99% Invisible Beyond the 99% Invisible City
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Dec 30, 2025 Explore the quirky history of stop signs, from why they're red octagons to the clever use of blue signs in private lots. Dive into the unexpected boom of miniature golf during the Great Depression, highlighting innovative designs and rooftop courses. Discover an intriguing peace park at the Blaine-Surrey border, and how it became a meeting spot during COVID. Plus, learn about Bermuda's unique roofs that capture rainwater and reflect heat, and how diners evolved from train cars with their clever designs.
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Shape Communicates Traffic Meaning
- Stop signs evolved from varied local designs into a standardized octagon in 1923 to communicate meaning through shape.
- Engineers believed shape conveyed danger level, with more sides signaling higher risk.
Red Became Standard Later
- Stop signs became red officially in the 1950s after material improvements made reflective red possible.
- Red fit broader visual language (stoplights, warnings) and natural warning associations.
Blue Stops Mark Private Signs
- Blue octagonal stop signs usually appear on private property to avoid confusion with official red government signs.
- Their color signals they are non-governmental while still conveying the stop message.
