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The cloisters of Gloucester Cathedral in England show an early example of fan-tracery, patterns carved on a vault.

Fan-Tracery of Cloisters of Gloucester Cathedral

The cloisters of Gloucester Cathedral in England show an early example of fan-tracery, patterns carved…

"Lady Chapel of Gloucester Cathedral, England, looking toward the nave." -Whitney, 1911

Gloucester Cathedral

"Lady Chapel of Gloucester Cathedral, England, looking toward the nave." -Whitney, 1911

"Medieval Groins in early 12th century vaulting. A, A, groins. GROIN. In architecture, the curved intersection or arris of simple vaults crossing each other at any angle." -Whitney, 1911

Groin Vault

"Medieval Groins in early 12th century vaulting. A, A, groins. GROIN. In architecture, the curved intersection…