=  Negative surfaces  =


''Caroline Virbel, Yi Zu, Mary Caron, Laura Gauché, Laura Leijnen et Mathilde Mus''.

Rapport sur le stage [[attachment:Stages/2012-02-20/cr_groupe_1.pdf]].
[[attachment:Stages/2012-02-20/neg_surf.jpg|{{attachment:Stages/2012-02-20/neg_surf.jpg|neg_surf.jpg|width=1000}}]]