What was notable about the oval staircase at Culzean Castle?

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Robert Adam Robert Adam, oil painting by an unknown artist; in the National Portrait Gallery, London.

The oval staircase at Culzean Castle is considered the highlight of the building's interior. It is notable for being a colonnaded structure that is lit dramatically from above. Although it was a late addition to Robert Adam's original plan, it serves as the compositional core of the castle.1