Deflecting this negative qi through geomancy is a preoccupation in feng shui. The Chinese divination practice of the I Ching has several striking similarities to geomancy. This system is used for geomancy and divination purposes. The trigrams have correspondences in astronomy, astrology, geography, geomancy, anatomy, the family, and elsewhere. Although it stems from a distinct tradition, the term "geomancy" now commonly includes "feng shui". The 16 geomantic figures are the primary symbols used in divinatory geomancy. He also wrote books about astrology, fate-calculation, and geomancy. He wrote that some biodynamic preparations more resemble alchemy or magic akin to geomancy. Similar forms of geomancy include scrying involving the patterns seen in rocks or soil. The division between the four "elemental" disciplines (viz., geomancy, hydromancy, aeromancy, pyromancy) is somewhat contrived. In addition, many temples were built in locations favored by the precepts of Chinese geomancy. Another mythological story for the origin of geomancy also involves Idris. Dante Alighieri's "Divine Comedy" (early 14th century) makes a passing reference to geomancy. Shakespeare and Ben Jonson were also known to use geomancy for comic relief. Geomancy was practiced by people from all social classes.