A straigth line -a monodimensional manifold- or a cylinder -a bidimensional manifold- in the distance? [Une ligne droite -une variété monodimensionnelle- ou un cylindre -une variété bidimensionnelle- vu de loin?]
See some related pictures (including this one):
(CMAP28 WWW site: this page was created on 06/17/2017 and last updated on 08/14/2020 10:17:40 -CEST-)