Terracotta is moulded. From each of Waterhouse's sketches, Monsieur Dujardin and his team of sculptors would create 3D statues from which plaster moulds could be made. Due to the large size of many of the ornaments, these moulds were then probably cut into sections, strapped together and liquid clay poured in to form the terracotta piece. Once dried, this was fired in a kiln, ready to be slotted into place on the museum building as you see them today.
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