Why do they wet the pavement in films and ads?!

Question:

while watching TV I often notice that the pavement is wet, even if it's not raining, on commercials and even in movies and magazine ads.

Additional Details

1 day ago
C'mon, someone must have a definitive answer for this!

15 hours ago
Yatin.....HUH?

10 hours ago
What do I get for stumping the board? LOL

Answers:

it adds depth to the picture. by drawing your eye to more details it enhances what you are looking at.

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