Perception is the process of attaining awareness and understanding of sensory information the action of taking possession, apprehension with the mind and senses.
http://en.wikipedia.org/wiki/Perception
” You perceive the world through an automatic filter of affordances. Your perception of a scene is not just the sum of its geometry, spatial relations, light, shadow, and color. Perception streams not just through your eyes, ears, nose, and skin, but is automatically processed through your body mandala to render your perceptions in terms of their affordances.” (p 106 – The Mind has a body of it’s Own – Sandra & Mathew Blakeslee)
Affordances is an idea posed by Psychologist James J. Gibson in his 1977 article “The Theory of Affordances” and explored it more fully in his book The Ecological Approach to Visual Perception in 1979. He defined affordances as all “action possibilities” latent in the environment, objectively measurable and independent of the individual’s ability to recognize them, but always in relation to the actor and therefore dependent on their capabilities.
Affordance is a concept that is widely used to talk about functionality, intent and action with in HCI (Human Computer Interaction), product design, and systems design.When users speak of an object being intuitive, easy to operate, clear and understandable, usually actions have been designed through a clear understanding of the affordance of the actions that are being accomplished.
Take the book for instance, the affordance of pages is sequential ( the english language is read top to bottom, left to right). The language process is a learned, as is the flipping of pages but the affordance of that action is one that is unique to the delivery of the media of language. The variety of this language delivery system is vast and deeply explored through both writing and the design of sequential artifacts. The perception of sequential media is filtered through the affordance of the page and meaning is associated with that artifact through cultural affordance. That is to say that the design of a bible has a particular cultural and meaning space in comparison to a Nancy Drew book while each posses a particular design functionality that is unique to it own content.
Unique to the page is its ability to contain extended meaning through design. The margins of sequential mediums can be signifier to the quality, and value the author has attributed to the ideas on the page. When design is considerate of the content to which it is attempting to communicate, said design can imply particular use scenarios and meaning that can extend and engage the experience of reading.
As technology becomes more and more involved within the delivery of media, the question of the format of delivery and the consideration of the delivery with in the design of the content
Through out the history of language, book, and narrative, the cultural importance of these artifacts has produced
check out thesis website : Marginalia: The Hybrid Textbook

