Wonder if you have the experience that when you look at a 3D lenticular mural the 3D effect will change depending how far you are away from the mural. When you walk closer to the mural the depth will become more shallow. On the contrary when you walk away from the mural the depth will become deeper.
The reason is very simple and can be explained by high school geometry. In our article titled The Relationship between perceived depth and viewing distance for 3D lenticular printing we derived the formulas and concluded that the perceived depth is always proportional to the viewing distance.