Better Airflow and Light 
Another advantage of the curved design is better ventilation.
If flower pots were placed right against flat bars, they could block air and sunlight. The outward curve moves the plants slightly away from the window, allowing:
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More fresh air to enter the room
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More sunlight to reach inside
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Windows to open more easily
This was especially important in older homes built long before air conditioning existed.
Practical Design That Became Beautiful
Over time, blacksmiths and craftsmen began turning these bars into works of art. They added elegant scrolls, patterns, and decorative shapes to the metal.
As a result, what started as a practical architectural solution slowly became an iconic design element seen on historic buildings around the world.
Many people today believe these curved bars were created only for decoration. But in reality, they represent a smart blend of:
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Security
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Functionality
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Gardening space
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Architectural beauty
