Mannikins of Horror

An inmate at an asylum crafts eerily realistic clay figures.

"Colin had been making the little clay figures for a long time before he noticed that they moved."

Weird Tales (December 1939)
Bloch and Bradbury (1969)
Complete Stories of Robert Bloch -- V 1: Final Reckonings (1990)

Adapted for the film Asylum (Amicus, 1972).