Final answer:
Vaulted ceilings in Gothic architecture allowed for spacious interior designs enhanced by stained glass windows and ornate stonework.
Explanation:
Vaulted ceilings were the architectural innovation that opened up the space of the interior during the Gothic period. The introduction of pointed arches, ribbed vaults, and flying buttresses allowed for taller interior spaces and thinner exterior walls, facilitating the use of stained glass windows to filter colored light into the interiors.
Additionally, the development of ornate stonework like tracery in the windows further enhanced the interior spaces of Gothic buildings, showcasing the innovative architectural advancements of the time.
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