[ExI] dynamics, attractors, knots

[scerir]

Étienne Ghys http://www.umpa.ens-lyon.fr/~ghys/
wrote an interesting (and difficult) paper
http://www.umpa.ens-lyon.fr/~ghys/articles/ghys-icm.pdf
showing that the Lorenz 'attractor' have 'periodic'
orbits which are 'knots'. A beautiful presentation
(pdf) with many interesting images is here
http://www.umpa.ens-lyon.fr/%7Eghys/articles/icm.pdf
with many interesting and difficult animations
http://www.josleys.com/show_gallery.php?galid=303
by http://www.josleys.com/

s.

A different subject, but see also
Planet Earth: 'extropic' shapes.
http://www.josleys.com/show_gallery.php?galid=313
and the 'FormaTerre' conference
http://www.formaterre.fr/archives/2006/conferences-2006/index.htm