Shells 
Stereoscopy
To visualise these applets in stereoscopy mode (that is, to have a tridimensional view of the represented objects), click once on key s. To see them properly, you shall need a stereoscopy kit that you may buy from Associação Atractor, here (for now, only in Portuguese).
It is also possible to view these (and other) applets with a 3D tv (for now, only in Portuguese).
For more stereoscopy content of Atractor click here (for now, only in Portuguese).
