The confluence of seeing and observing is central to the concept of mindfulness, a mental alertness that takes in the present moment to the fullest, that is able to concentrate on its immediate landscape and free itself of any distractions.
It's completely unrelated to the article, but one detail that bugged me about the Sherlock Holmes stories (At least the short stories), is that they are tilted far more towards fiction than puzzles. Sherlock is held up as a genius hero, but in most of the stories, the reader isn't given all the clues to solve the mystery before Sherlock explains the answer.
Be it the mud caked on the murderer's shoes or the opened letter sitting on the table, these details are omitted from the reader's experience altogether until the story's finale where they are revealed as the critical details to solve the case.
Doyle didn't do it in every story he wrote, but he did it enough for me to get annoyed and turn to other mystery writers instead. Maybe it was a symptom of having to generate short stories where you couldn't rely on a reader's hazy memory to hide all the facts you told them.