Comparing two geometric problems 
Applet about Hexlet (*)
- Applet - mono version
- Applet - stereo version - to see it properly, you shall need a stereoscopy kit that you may buy from Associação Atractor, here (for now, only in Portuguese).
(*) This work was carried out under the project "Conteúdos
virtuais de Topologia e Sistemas dinâmicos" of the Apoio C&T
Program, supported by Ciência Viva, POCTI and FEDER.
