Taking pictures is like fishing

You have to go to the fishing hole where there are plenty of fish, you have to go at the right time (of the day and season), you have to bring your tools, and you have to know how to use your tools well, now you catch a decent fish.
What happen if you want to have another good catch?  Bring your tools to the same fishing hole, at almost the same time, with a good hope that you'll have another good catch.
The pictures were taken 3 years apart - the top one in June 2007, at around 3pm, the bottom one in July 2010, at around 6pm, at exactly the same spot.  What a difference!