Modelling

A sculpture technique in which a three-dimensional form is manipulated in a soft material such as clay — either modeling clay (Plasticine is a well-known brand) or ceramic clay — or wax. The term also refers to the effect of light on a three-dimensional form. The three-dimensional quality of such a form is emphasized by means of light, shadow, and colour. Reproducing the effect of light, shadow, and colour in a drawing of such a form makes it seem more realistic.  (Artlex.com)

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