Signs of time
Sometimes in everyday life we get struck by an observation. In fact, what we're interested in here are those observations which become so recurrent that they don't really strike you any more, although they once did.
These are often signs of change, and it is interesting to think how these could impact on your strategies.
By dismissing these signs you risk to miss opportunities that the change can offer. On the other hand, by generalising singular events into signs of time you will impoverish your strategic thinking with invalid perceptions.
Therefore the difficulty is in deciding what is a sign of change and what is simply a particular event (even if it happens many times).