Impasto
Impasto is a term used in painting and sometimes in pottery.

Taos Mountain, Trail Home by Cordelia Wilson (1920). In higher resolution the impasto is very clear.
It means the paint is laid on thickly in places, thick enough so the brush or painting-knife strokes can be seen. When dry, impasto gives texture, because some of the paint stands out from the canvas.
Impasto is an Italian word which means "to knead", or "to paste".
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