Power point

http://chantalserriere.blog.lemonde.fr/2009/11/29/la-solution-les-chaises-de-ionesco/

http://pascalelafraise.files.wordpress.com/2010/03/cropped-blog32.jpg

http://sds.parsons.edu/blog/2009/04/14/styrofoam-used-tray-project-no-tray-left-behind/