What new Gothic feature appeared in Laon's nave elevation?

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The new Gothic feature that appeared in Laon's nave elevation is the triforium. This architectural element, typically found between the nave arcade and the clerestory in a Gothic cathedral, is a shallow arched gallery within the thickness of an inner wall, above the nave arcade and below the clerestory windows. It was a significant development in Gothic architecture, allowing for a more complex vertical division of the interior space and contributing to the characteristic light and lofty appearance of Gothic cathedrals.

What New Gothic Feature Appeared in Laon's Nave Elevation