Help 色なき風 "colorless wind" as a motive

[Fearabhata]

I read this in a few poems and songs, but I never quite understand what it means.
Wind by itself is always colorless or not? What is the idea behind it or is it just of those lofty phrases that never make sense?

 

[Majestic]

Refers to autumn wind. "No color" means just that, but it refers to the dying leaves and the shortened gray days of autumn, as opposed to the spring where there are flowers in bloom and green leaves returning to the trees.

 

[Fearabhata]

Sankyu!