Complexified Pseudosphere

http://demonstrations.wolfram.com/Com... The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. The parametrized surface r(theta, phi) = {x, y, z} = Re({theta - tanh(theta), cos(phi)sech(theta), sin(phi)sech(theta) }) is called a pseudosphere. This Demonstration plots a linear combina... Contributed by: Michael Trott with permission of Springer From: The Mathematica GuideBook for Graphics, second edition by Michael Trott (copyright Springer, 2008).