In examining decisions about representations and interactions when designing for
different geometries for the flat screen, we focus on three geometry technologies that
are common to mathematics classrooms: 2D ‘dynamic geometry’ environments
(such as Cabri and Sketchpad), software for 3D geometry (with 3D Euclidean
geometry illustrated by Cabri 3D, and 3D coordinate geometry software illustrated
by Autograph), and software suitable for various non-Euclidean geometries
(illustrated by the use of Logo).