The House of Silk the possibilities of an Atlantic or a Niagara? Can he astonish us? Can he thrill us? Are there "the rapid deductions, as swift as intuitions, and yet always founded on a logical basis" that we yearn for? Emphatically, yes. In chapter one there is some mention of C. Auguste Dupin, a character developed by author Edgar Allan Poe, and his ability to make astounding deductions based on visible emotions reflected through the physical medium. Holmes demonstrates this by uncovering Watson's anxiety and the source thereof. This mention of Dupin is in itself a reference to a reference made by Conan
Dupin indicatrix Dupin indicatrix In differential geometry, the Dupin indicatrix is a method for characterising the local shape of a surface. Draw a plane parallel to the tangent plane and a small distance away from it. Consider the intersection of the surface with this plane. The shape of the intersection is related to the Gaussian curvature. The Dupin indicatrix is the result of the limiting process as the plane approaches the tangent plane. The indicatrix was invented by Charles Dupin. For elliptical points where the Gaussian curvature is positive the intersection will either be empty or form a closed curve. In the