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Polygonal Masonry

Polygonal masonry is a distinctive form of stonemasonry characterized by the use of stones with multiple edges, typically five or more, forming non-rectangular shapes. This contrasts with ashlar masonry, which uses finely dressed stones with rectangular shapes. Polygonal masonry is a historical construction technique that can be found in various ancient structures around the world, reflecting the ingenuity and craftsmanship of ancient builders.

Historical Context

Polygonal masonry has been identified in several ancient civilizations across the globe. One of the earliest and most famous examples is found in Greece, particularly in Cyclopean masonry associated with the Mycenaean civilization. This type of masonry was named "Cyclopean" because the stones were so massive that later cultures believed only the mythical Cyclopes could have moved them.

In ancient Italy, polygonal masonry is predominantly found in the region of Latium. It is also present in regions such as Etruria, Lucania, Samnium, and Umbria. Scholars, including Giuseppe Lugli, have extensively studied these techniques. Notable archaeological sites with polygonal masonry include Norba, Alatri, Boiano, Circeo, Cosa, Alba Fucens, Palestrina, and Terracina.

In the Inca Empire, polygonal masonry is prominently featured in constructions such as Sacsayhuamán in Peru. The Inca developed a unique form of polygonal masonry using precisely cut stones that fit together without the use of mortar, allowing these structures to withstand seismic activity.

Architectural Techniques

Polygonal masonry can be categorized into several subtypes based on the size and arrangement of the stones:

  1. Cyclopean Masonry: This involves the use of massive, roughly hewn stones. The construction is often dry-laid, meaning no mortar is used. The appearance is somewhat random, with stones of varying shapes and sizes fitting together.

  2. Cellular Polygonal Masonry: This subtype uses smaller blocks and features a more uniform and organized appearance. It is often seen in defensive walls and fortifications.

  3. Ashlar Polygonal Masonry: This involves very large stones cut to fit precisely together. The technique is employed in structures requiring greater durability and resistance to natural forces.

  4. Encased Coursed Masonry: In this variant, stone blocks are laid in continuous horizontal courses, providing a blend of stability and aesthetic appeal.

Cultural Significance

Polygonal masonry not only showcases the technical prowess of ancient builders but also reflects geographical and cultural influences. The spread of this technique across different regions suggests a transfer of knowledge and skills, possibly through trade and conquest.

For example, the Tunnel of Eupalinos includes sections with polygonal masonry at its southern end, indicating the use of this method in ancient Greek engineering projects. Similarly, the ceremonial center of Ahu Vinapu on Rapa Nui (Easter Island) features polygonal masonry that echoes Inca techniques, demonstrating potential cultural exchanges across the Pacific.

Related Topics

Polygonal masonry remains a testament to the ancient world's architectural ingenuity, exemplified in its enduring structures and the cross-cultural diffusion of its techniques.