Example 6.83.
For a presheaf topos \(\PSh(C)\), the terminal morphism is essential by Example 6.79, and its shape is represented by
\[\abs{\PSh(C)} \quad\simeq\quad \colim_{c \in C\catop} * \;\simeq\; \abs{C},\]
the classifying anima of \(C\). In particular, \(\PSh(C)\) has constant shape.