I used image to lithophane (http://3dp.rocks/lithophane/) and an image of the Philadelphia Fire Mark "Clasped Hands" to create this file. I was facinated by the marks while visiting Philadelphia and was hoping to find one that could be printed. I have not been able to so I made this one. The explanation of the marks can be found in this link: http://www.phillymag.com/property/2013/05/03/the-storied-fire-marks-of-philadelphia/