Most ceramic sculpture is hand-built. Pinch, coil, and slab are the core techniques. Sculptors also carve (subtract clay), add pieces, press into molds, and sometimes build over temporary supports. Joining almost always means scoring both surfaces and brushing on slip before pressing them together.
Pinch
Colorado State University Extension’s hand-construction unit treats pinch pots as a basic method: a ball of clay opened with the thumb and thinned by rotating and squeezing. For sculpture, two pinch forms can be joined into a hollow body; limbs and features can be added as coils. The same materials recommend uniform wall thickness and careful mending of cracks with a little water.
Coil
Coils are rolled ropes of clay stacked and blended to raise a form. Coil building suits tall or irregular hollow sculptures. Extension sculpture materials list coil building as suitable for tall sculptures, big shapes, and hollow forms. Blend coils inside and out so seams do not trap air or leave weak rings.
Slab
Slabs are rolled sheets of clay. They suit geometric sculpture, boxes, wall pieces, masks, and flat planes that will be bent or draped. Extension projects often roll slabs with guide sticks for even thickness (for example about ⅜ inch in some beginner projects). Soft slabs bend; leather-hard slabs cut cleanly.
Solid build and hollowing
Artists sometimes model solid and then hollow the piece from below with loop tools, or build hollow from the start. Extension sculpture guidance says to hollow sculptures thicker than about a thumb and keep walls under roughly ½ inch in their student projects, because trapped moisture and thick walls raise the risk of cracking or exploding in the kiln. Enclosed hollow forms need a small air hole.
Armatures
An armature is an internal support used while clay is soft. For work that will be fired, studio practice generally requires that combustible or metal supports be removed, or that the clay be built as a hollow shell that can fire safely — methods described in figure-sculpture instruction such as Cristina Córdova’s Mastering Sculpture: The Figure in Clay (Quarry Books), which the Amazon listing summarizes as covering armatures and hollow forms safe to fire. Do not fire unknown materials inside clay without instruction.
Additive and subtractive detail
Features (noses, ears, texture) are often added as small pieces after scoring and slipping. Carving and impressing create subtractive or pressed texture. Extension checklists list additive sculpting, carving, press molding, and slip casting among sculpture techniques.
Sources
- Colorado State University Extension, Ceramics Unit 7 — Sculpture (PDF)
- Colorado State University Extension, Ceramics Unit 1 (PDF)
- Mastering Sculpture: The Figure in Clay (Córdova)