 The loxodrome has an infinite number of revolutions, with the separation between them decreasing as the curve approaches either of the poles, unlike an Archimedean spiral which maintains uniform line-spacing regardless of radius.The study of spirals in nature has a long history.Christopher Wren observed that many shells form a logarithmic spiral; Jan Swammerdam observed the common mathematical characteristics of a wide range of shells from "Helix" to "Spirula"; and Henry Nottidge Moseley described the mathematics of univalve shells.