Sir Arthur Conan Doyle … Sherlock Holmes … Tracking … When he created Holmes, Sir Arthur had his character develop one primary skill, observing details, sometimes minute or obscure. And like a talented artist or photographer, Sir Arthur applied shadow – the bad guys, to define his subject – Holmes.
Holmes was really good at what he did, and like a tracker he read the details to build his understanding of events, intentions, causes, actions, personalities, and timing. Even without the full details one can often deduce the story by teasing the significant information out of the available facts.
Sorry for this digression … If you’ve read and enjoyed Sir Arthur’s works, you might also enjoy those of Laurie R. King who has done an outstanding job of continuing the life of Holmes.
Back to the point … Light, while not essential to tracking, sure is useful. And it can be deceiving or bring out the details … Whose track is this?
Oh, sorry let me adjust the light … Adding shade and reflecting sunlight in…
The point here being how to see the details of what you are observing.
Here is another example.