Work on the logarithmic spiral, which had been rectified by Wallis in the late 1650s, led Wren to note that it was possible to consider an area preserving transformation which would transform a cone into a solid logarithmic spiral.
Trabaho sa logarithmic ikid, na kung saan had been rectified by Wallis sa late 1650s, na humantong Wren na tandaan na ito ay posible na isaalang-alang ng isang lugar na kung saan ay pagpepreserba pagbabagong-anyo ng isang kono sa isang solid logarithmic ikid.