Tiānrán Chīsǒu 天然癡叟 (“The Naturally Foolish Old Man”) is the pseudonym of the late-Míng author of the short-story collection Shí Diǎntóu 石點頭 KR4k0064. The identity of the person behind this pseudonym has not been established with certainty. No CBDB entry or independent biographical record has been identified. The pseudonym is characteristic of the late-Míng practice of publishing vernacular fiction under self-deprecating or spiritually suggestive pen-names.