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From Wikipedia, the free encyclopedia

A tessera (plural: tesserae, diminutive tessella) is an individual tile, usually formed in the shape of a square, used in creating a mosaic. It is also known as an abaciscus or abaculus.

The unique illuminating effect of golden tesserae, Cappella Palatina in Palermo, Sicily, 12th century
A mosaic made from tesserae in St Peter's Basilica, Vatican State, Italy
A close up of the bottom left corner of the picture above. Close inspection of the full picture reveals the individual tesserae.

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Transcription

Historical tesserae

Apse mosaic of the Virgin Mother and Child, Hagia Sophia, featuring intensely luminous golden tesserae

The oldest known tesserae date to the 3rd millennium BC, discovered in the ancient city of Shahdad in Kerman province, Iran.[citation needed]

In early antiquity, mosaics were formed from naturally formed colored pebbles. By roughly 200 BC cut stone tesserae were being used in Hellenistic-Greek mosaics. For instance, a large body of surviving material from the Hellenistic period can be found in the mosaics of Delos, Greece, dating to the late 2nd century BC. Ancient Roman decorative mosaic panels and floor mosaics were also produced during the 2nd century BC, particularly at sites such as Pompeii. Marble or limestone were cut into small cubes and arranged into representational designs and geometric patterns.

Later, tesserae were made from colored glass, or clear glass backed with metal foils. The Byzantines used tesserae with gold leaf, in which case the glass pieces were flatter, with two glass pieces sandwiching the gold. This produced a golden reflection emanating from in between the tesserae as well as their front, causing a far richer and more luminous effect than even plain gold leaf would create.

Contemporary tesserae

Wooden block with hammer and hardy for cutting mosaic tiles.

Vitreous glass

These are manufactured glass tiles made to a uniform shape and size. They are made by molten glass being poured into trays and fired. An imprint of grooves is made on their underside for help with adhesion to cement when fixing.

Iridised, marbled, & metallic tesserae

Iridised (with a reflective quality), marbled (featuring contrasting and complementary colors), metallic (semi-transparent with gold or bronze veins), and millefiori (round handmade Murano tesserae with intricate patterns) tesserae are also widely used.[1]

Ceramic tesserae

These are the cheapest range of bought materials and can be glazed or unglazed. The glazed ceramic tiles have the color painted onto the top of the clay and then fired to a high temperature in a kiln. The unglazed or body glazed version has the color mixed into the wet clay so the color runs through them. They vary in size.[2]

Smalti

This is the classic mosaic material. It is opaque glass fired in large slabs in a kiln and then hand cut into small cubes with a hammer and hardy chisel. Their irregular finish makes them a wonderful reflector of light and this material is best used working straight into cement. It is produced in Venice and sold by colour and weight.[3][4]

Gold smalti

This tile is made with gold and silver leaf sandwiched between two layers of glass and fired twice in the kiln to embed in the metal.

Mirror

Mirror fragments are available as offcuts from glass cutting shops.

Stained glass

Opaque stained glass comes as large sheets that can be cut into smaller sections with a glasscutter.

Household ceramic tiles and china

Various household objects, including pottery shards, can be used, especially in trencadís or pique assiette technique.

See also

  • Tessellationdescribes tessellation patterns
  • Mosaicdescribes techniques for assembling tesserae into a design

References

  1. ^ "Storytelling With Tesserae". Mosaicist. 8 June 2023.
  2. ^ "Mosaic Tiles Guide". Monday, 12 April 2021
  3. ^ Govind, Ranjani. "Small tiles, big tales". The Hindu. Retrieved 25 September 2015.
  4. ^ Menhem, Chantal (24 June 2015). "Numerous Tiles and Tesserae Making Mosaics". Mozaico. Archived from the original on 25 September 2015. Retrieved 25 September 2015.

External links

  • Media related to Tessera at Wikimedia Commons
This page was last edited on 8 June 2023, at 21:16
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