"Kalasha" means "pitcher" in Hindi.
The kalasha is an inverted vase-shaped element that caps the temple towers in the Nagara style of temple construction, which is mostly seen in northern India (shikharas).
Gold kalashas were used to give a beautiful contrast above the stone in several circumstances.
A flag is usually flying from the kalasha atop the topmost tower.
The kalashas represent the crown of the head, the highest and purest portion of the body, as the architectural symbolism in Hindu temples conforms to the structure of the human body.
They're also a representation of humanity's greatest religious potential.
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