Mosaics are assemblages composed out of tessera (small pieces of glass, stone, or other nature-based materials).

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Explanation:

The definition of mosaic:

mo·sa·ic

/mōˈzāik/

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noun

1.  a picture or pattern produced by arranging together small colored pieces of hard material, such as stone, tile, or glass.

"the walls and vaults are decorated by marble and mosaic"

there is not really a certain expensive film type but i believe all of them cost mostly the same price, i hope this a little bit