Abe Morell's photographs help us recognize the beauty in simples things. Here, the photograph creates a rich and evocative image of the alphabet written in water. Our vision has expanded beyond simple descriptions. We want to go more in depth on what images mean. Now, think about these questions in terms of educational materials.
Images offer rich concepts essential to learning.
For others, including those with visual impairments, images may be obscure or unusable. This principle suggests that essential content should never be provided in only one medium, which may create barriers for some learners. Thus, an image should be accompanied by other representations such as textual descriptions that can be read aloud. There are conventions for creating images and using them, an image 'grammar' if you will. To effectively represent an image through alternative media, we have to understand an image's content and the purpose of its use.