• Visual images are represented in a special, spatial medium.

• The spatial medium has four essential properties: (i) it functions as a space, with limited extent, it has a specified shape and a capacity to depict spatial relations; (ii) its area of highest resolution is at its centre; (iii) the medium has a grain that obscures details on "small" images; (iv) once the image is generated in the medium it begins to fade.

• Long-term memory contains two forms of data structures: image files and propositional files, Image files contain stored information about how images are represented in the spatial medium and have an analogical format. Propositional files contain information about the parts of objects, how these parts are related to one another and are in a propositional format Propositional files and Image files are often linked together.

• A variety of processes use image files, propositional files, and the spatial medium in order to generate, interpret, and transform images.

the propositional and image files that store the knowledge about the duck, and the processes that generate the image in the medium from these files.

Image files

Skeletal image of a duck

Pro posit ion a I files

Business Correspondence

Business Correspondence

24 chapters on preparing to write the letter and finding the proper viewpoint how to open the letter, present the proposition convincingly, make an effective close how to acquire a forceful style and inject originality how to adapt selling appeal to different prospects and get orders by letter proved principles and practical schemes illustrated by extracts from 217 actual letter.

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