There are lots of ways to make clay molds. Case in point: Nancy Zoller's textured bisque molds.
The Chipstone Foundation
Mayco Stoneware Black Walnut Black walnuts, Stoneware, Stains
Ceramic Library — Posts — The Studio Manager
Pottery History, Types & Techniques, What is Pottery?
Пин на доске деревяшка
Plates
stud io reference - Ceramic Arts Daily
Can I Make Pottery Without a Kiln? – Creek Road Pottery LLC
Tassen Töpfern