It is true enough that the photograph provides a context for the sentence you have been given, and that the sentence provides a context of sorts for the photograph, and you may even believe for a day or so that you have learned something. But if the event is entirely self-contained, devoid of any relationship to your past knowledge or future plans, if that is the beginning and end of your encounter with the stranger, then the appearance of context provided by the conjunction of sentence and image is illusory, and so is the impression of meaning attached to it. You will, in fact, have “learned”
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