…In a primary oral culture, the expression ‘to look up something’ is an empty phrase: it would have no conceivable meaning. Without writing, words as such have no visual presence, even when the objects they represent are visual. There are sounds. You might ‘call’ them back – ‘recall’ them. But there is nowhere to ‘look’ for them. They have no focus and no trace.
Walter J. Ong, “Try to Imagine,” as quoted by James Gleik in The Information.
Today’s ponderable when (almost) everything is a quick search away.