This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Use cubic bézier curves instead of polygons.
Gnuplot script
# Output to svg file:
set terminal svg size 1024 768
set output "logarithmic_spiral.svg"
# Same scale for both axes, half-size output:
set size ratio -1 0.5, 0.5
# More sample points to produce smoother picture:
set samples 480
# Axes in the center, no tick marks:
set zeroaxis
unset xtics
unset ytics
unset border
set polar
plot [-4*pi:4*pi] [-8:10] [-8:6] 1.19**t notitle
Licensing
Public domainPublic domainfalsefalse
I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.