When you use an Image Map, plugged into a PoserSurface Reflection Node, the Image Map is considered a Reflection Map.  The Image_Map node will be graphed onto a Mathmatical Sphere, that surrounds you Poser Scene; and what "Reflectes" on and off of your object will be  calculated soley based on this Image_Map.  Lots of spheres are significantly different.  The Map I'm using here was generated by Vue, for mapping onto a Vue sphere object.  The Lighting > Environmental Map > sphere_node you see I've added; helps translate my, or any, map into the specific sphere Poser will be using.