Finally, it is clearly stated that reading, listening, watching and understanding are extremely productive activities in themselves. The perception of texts, images, lectures or music requires considerable work from those who do it. The same applies, by the way, to the handling of signs and objects, because it is almost inevitable that people work with them and acquire them through their own productive efforts.

Thus, all those who formulate and design something should thank the recipients for their understanding or even just for their the attempt to understand and use any artifact (or poems etc.).