Yantras or Mechanical Contrivances in Ancient India c2.181

c2.181

Bhoja concludes this section with the observation that not only these, but many more similar contrivances could be invented; even movements impossible in actual life are possible in yantras. Regarding the actual process of making these, Bhoja says that, though it is not set forth, the constituent elements and basic principles have been mentioned, so that men of imagination could easily construct these. Silence on the actual mode of construction is said to be for preserving this important knowledge, for giving a material advantage to the architects, and for enhancing curiosity about these yantras. (79-81).