https://en.wikipedia.org/wiki/Bulletproof_glass
A rough visualisation of bulletproof glass, composed of layers of plastic sheeting (black) and layers of glass (blue)"Rough visualisation of bulletproof glass". Licensed under Public Domain via Wikipedia - https://en.wikipedia.org/wiki/File:Rough_visualisation_of_bulletproof_glass.jpg#/media/File:Rough_visualisation_of_bulletproof_glass.jpg