Teapots are deceptively complex objects.
A good teapot has to do 5 jobs.
A successful teapot must:
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Let you open it up to put tea leaves & hot water inside
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Provide enough internal space to let the tea leaves mix freely with the hot water
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Pour without dribbling or leaking from under the lid
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Have a handle that lets you grasp & pour it in a controlled way without burning your hand off
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Be easy to rinse out & clean afterwards
Different cultures have arrived at different teapot designs to solve these problems.