modelling is a process which the form is built up using a malleable material, such as clay or wax. this gives the sculpture much greater freedom because one can add or subtract material to the form, allowing for mistakes to be made.
when doing large scale sculptures its not uncommon to create an armature or internal skeleton that helps to support the malleable substance. the armature must also be thoroughly thought through as the rest of the sculpture will be depending on its shape. another thing to take into consideration is the texture of the surface, taking advantage of the pliability of the material. modelling tends to be the medium between constructing and carving, favourited more by the direct and spontaneous sculptor.
carving is a process that is basically subtracting the material to create a form. materials used tend to be wood or stone but as i explained before plaster can also be used after casted.
carvings were traditionally created from stone, such as marble, granite, limestone and sandstone. these materials, particularly marble, are extremely hard and require a great degree of patience to sculpt (during the renaissance period, a life-sized sculpture of a person would take many years to carve)
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