(19) Display of an image or video showing the target object (goal state) or the transformation procedure at a fixed position in the field of view [1] 


(20) Display of a superimposed semi-translucent video showing the transformation procedure [3]


(21) Display of an image or video showing the target object (goal state) and transformation procedure at a fixed position in the field of view in accordance with the viewing angle [4]


(22) Display of an image or video, or 3D model showing the target object goal state and transformation procedure, near the location of work


(23) Display of a 3D model or 3D CG animation showing the transformation procedure, which is superimposed on the target object [1]