You will never be able to describe why.
The Nursery is not a single room. It is an archipelago of forgotten playrooms, each one containing a different season. In the Western Wing (which is actually south, but the girls renamed it long ago), the Floor of Spilled Tea stretches for miles. Here, immortal girls in pinafores host tea parties that have been ongoing since the Bronze Age Collapse. The tea is cold. The cakes are dust. But the conversation—about the migration patterns of imaginary tigers, about the ethics of hiding your sister’s left shoe—is the most profound you will ever hear. the immortal girls nursery travelogue
Age 3 (physically). Actual age: Unknown. You will never be able to describe why
Conversely, it maintains a following among fans of the "seedbed" trope and "monster-girl" erotica who appreciate the detailed artwork by Fujihan and the unique, if bizarre, premise of an immortal genius protagonist. Reddit·r/animenocontext In the Western Wing (which is actually south,