"The book of formation of the world": "Sefer Yetzirah" and "Hilkhot Yetzirah"

The Babylonian Talmud contains a tale about the creation of an artificial calf by two sages who dealt with hilkhot yetzirah, or laws of formation (b. Sanhedrin 65b). Already in the eleventh century CE the phrase “Laws of Formation” was being used to refer to the short, enigmatic, and influential treatise Sefer Yetzirah (Book of Formation), which depicts the creation of the world by means of the twenty-two letters of the Hebrew alphabet. The connection between hilkhot yetzirah and Sefer Yetzirah is of great consequence in determining the period in which the latter was edited, as well as its reception history.