A more positive reason is that, like language, pictures contain information about something they themselves are not (see Sabrina's information taxonomy). I have a hunch that an ecological study of picture perception might help guide an ecological study of language, because the former can take more direct advantage of the work already done about how we perceive meaning in events via ecological laws but then act as a bridge, a point along the way to the conventional world of language meaning.
Finally, the topic seems to be woefully understudied in the ecological approach. There is some, however. In the comments section on my rant about using pictures to study affordances, I was pointed to the work of John Kennedy (a Gibson student, now emeritus at the University of Toronto). I have downloaded his 1974 book, 'A Psychology of Picture Perception' and am working my way through it. Matthieu de Wit then linked me to an archive of a discussion, in papers, between Gibson and Ernst Gombrich about picture perception. I thought I'd start with Gibson (1971), The Information Available in Pictures, to begin to sketch out what we know and what we don't.
The current question at hand is, can pictures provide the same information about the things they depict?
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