What is different in this picture?

Use of the phrase "What is different in this picture?" greatly improves our security service delivery. Because we walk the same property day in and day out it is easy to no longer SEE the area. It all becomes terminally, boringly the same, quickly. Like the cartoon drawings in the newspapers where two apparently identical drawings in fact have subtle differences. This is analogous to the security officer's patrol. As we enter each area, we look for what is different from the last time we passed and judge its security implications, if any. It could be people, cars, litter, fences and gates or doors. Few things would require action, but we get paid to observe and observation may save our lives.