Stunning keepsakes that will last forever This case study explains what lithophanes are and how these priceless 3D pictures can be CNC machined using PhotoVCarve. With the ever increasing demand for unique personalized work, why not use your CNC router or engraving machine to family portraits that will last for generations. Family, friends and work colleagues will all want 3D Lithophanes of their loved ones carved into permanent visible memories that won't fade or age.