Tech in Photo:- Coralie Gourguechon’s Speaker Is Made From A Single Sheet Of A4 Paper Posted by Neha Singh on January 17, 2014 in Tech in Photos | 70 Views | Leave a response Share!!!Made with the help of single A4 sheet, this paper cone shaped speaker work like any other speaker with its electrical components including battery, cables , circuits attached externally on a flat paper. Pop out the cone and enjoy amplified music. Share!!!