There are two basic methods to mosaic work – the direct method and the indirect method. In the direct method, the pieces of material you are going to mosaic with, known as tesserae, are directly fixed top side up onto a base or substrate and then grouted. In the indirect method pieces are temporarily fixed top side down onto a removable base material. This is then cast in its final form and the temporary base material is removed to reveal the mosaic, top side up. The indirect method is most often used when the finished surface needs to be extremely smooth.
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