 The term “fine-tuning” is used to characterize sensitive dependences of facts or properties on the values of certain parameters. Technological devices are paradigmatic examples of fine-tuning. Whether they function as intended depends sensitively on parameters that describe the shape, arrangement, and material properties of their constituents, e.g., the constituents’ conductivity, elasticity and thermal expansion coefficient. Technological devices are the products of actual “fine-tuners”—engineers and manufacturers who designed and built them—but for fine-tuning in the broad sense of this article to obtain, sensitivity with respect to the values of certain parameters is sufficient.