There are so many ways to go, the detectives know, opposition and conflict, theories drifting over and beyond one another. Things changed by the act of observation. The old laws of physics. Speed and position. Time and distance.
They will comb through images, looking for any random detail, the breeze of surprise, a clue. The more obscure the moment, the more valuable the knowledge. There is always a chance they will spot something they already overlooked.
They work in much the same way as poets: the search for a random word, at the right instance, making the poem itself much more precise.
—Colum McCann, Thirteen Ways of Looking (Bloomsbury Publishing, 2015).