Map filters use an object named map to modify an image: you map the image to the object. So, you can create 3D effects by mapping your image to another previously embossed image («Bumpmap» Filter) or to a sphere («Map Object» filter). You can also map a part of the image elsewhere into the same image («Illusion» and «Make Seamless» filters), bend a text along a curve («Displace» filter)...