Chapter 19

escher.epfl.ch/escher/

www.geom.uiuc.edu/java/Kali/

www.wordsmith.org/~anu/java/spirograph.html

http://csdt.rpi.edu/african/African_Fractals/

classes.yale.edu/fractals/index.html

http://www.math.smith.edu/phyllo/index.html

http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fib.html