Slide 1
A mosaic assembles an image from separate pieces
A mosaic makes pictures from separate pieces set into a surface. The small pieces in many Roman mosaics are called tesserae.
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Earlier pebble mosaics used naturally rounded stones. Cut tesserae expanded the range of shapes available to the maker, changing how closely pieces could follow an image.
Slide 2
Rows of tesserae can follow the curve of a figure
Rows of tesserae can follow a contour instead of forming a uniform grid. Their direction helps describe the shape of a figure.
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An outline is therefore more than a change of colour. The arrangement of the individual pieces can guide the eye, even where neighbouring materials have similar tones.
Slide 3
Physical materials provide the colours
Mosaics can combine pieces of different materials and colours. The maker chooses physical fragments rather than mixing every tone as wet paint.
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The surface rests within a system of bedding and support layers. Damage in those hidden layers can threaten an image even when its coloured pieces remain intact.
Slide 4
A Roman floor mosaic was encountered through movement
Many Roman mosaics were parts of floors. People originally encountered their images while moving through an architectural space.
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A museum display can separate a mosaic from the surrounding room. Interpreting it may require reconstructing its former placement, scale and relationship to routes through a building.
Slide 5
Caring for the image also means caring for its structure
Caring for a mosaic means attending to both its image and its physical assembly. Loose pieces are evidence of a structural problem.
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Recording the position and condition of tesserae preserves information before intervention. Documentation matters because repair can otherwise blur the distinction between surviving material and later work.
Sources
- Roman Mosaics introduction
Getty
- Technician training for maintenance of in situ mosaics
Getty Conservation Institute