The great flood of 2011. been living here all 21 years of my life, never seen Downtown like this.
J.D. Copr. 2014. All Rights Reserved.
Another interesting property of the logarithmic spiral is revealed if you roll it along a horizontal line. This animation shows the curves traced by points on the spiral, and note that the very centre follows the path of a straight line. The angle between this line and the horizontal is called the pitch of the spiral, and for our spiral galaxy the pitch is around 12 degrees. [more] [code]