What technique involves removing glazed ceramics from a kiln while they are glowing red hot?

Raku is a distinctive ceramic firing technique characterized by its unique approach to glazing and firing. This method involves removing the pottery from the kiln while it is still glowing red hot. Once the ceramics are taken out, they are often placed in combustible materials such as sawdust or leaves, which ignite and create a reduction atmosphere. This process results in distinctive surface effects, including varied colorations and crackling of the glaze. The rapid cooling and exposure to these materials contribute to the aesthetic qualities that are highly valued in Raku pottery.

The other techniques mentioned, such as pendentive, camera obscura, and crenellation, do not relate to the removal of ceramics from a kiln and rather pertain to different aspects of art and architecture. Pendentive is a structural element used in architecture, camera obscura relates to an optical device for projecting images, and crenellation refers to the architectural feature of battlements. Each of these terms operates within separate disciplines and contexts that do not involve the Raku firing technique.