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How does the indirect method of making mosaics work?
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mosaic
Mosaic floor fragment from a synagogue or church, cut stone with mortar from Israel, late 5th–6th century ce; in the Jewish Museum, New York City.
The indirect method is a technique used to create mosaics by assembling them in a workshop before they are installed on their final surface. Unlike the direct method, where tesserae are placed one by one directly onto a mortar bed, the indirect process involves the following steps:
- Reverse Assembly: The mosaic is first set in reverse, with the face of the tesserae glued onto a temporary backing of paper or cloth.
- Application: Once the design is preassembled, the entire section is applied to the final floor or wall surface.
This technique is particularly advantageous for large-scale projects and allows for the prefabrication of mosaics intended for complex or curved surfaces, such as cupolas or apses. While historical precursors existed—such as the Roman practice of presetting central panels (emblemata) on trays—the indirect method became the most widely used approach in the 20th century, facilitating mass production and efficient architectural decoration.12