...innocence of eye has a quality of its own. It means to see as a child sees, with freshness and acknowledgment of the wonder; it also means to see as an adult sees who has gone full circle and once again sees as a child - with freshness and an even deeper sense of wonder.
Minor WhiteWhile we cannot describe its appearance (the equivalent), we can define its function. When a photograph functions as an Equivalent we can say that at that moment, and for that person the photograph acts as a symbol or plays the role of a metaphor for something that is beyond the subject photographed.
Minor White