I'll take a stab at describing morphs... Morphs are an altered geometry for a "thing" (face, body part, prop part, etc.) It serves as the target for the morph of the original "thing" from which it was made. I guess the classic example is Vulcan ears. Someone would take an .obj of a characters head and then alter the mesh so that the ears were pointed. Back in Poser, you can add this morph target to that character. When you do, it gives you a dial. At its simplest, the dial would have a 0 to 1 value. 0 would mean the morph target is not applied in any way. A value of 1 would mean the morph target is fully applied to the characters geometry. When you dial up the morph, Poser alters the character progressively to match the morph target. At a setting of .5 the characters geometry would be altered in poser to look half-way like the target Vulcan ear geometry. At a setting of 1, it would be altered to fully match the Vulcan ear geometry. The effect of multiple morph targets get blended together.