Is cloud a shadow itself?

One of the most popular feature in our world, and the most ignored perhpas. Without light, we don't see the cloud, to me, the cloud is the shadow of itself. Light and shadow is everyday experience, and so is the cloud, although much people don't pay attnetion that the existense of cloud is in fact often the gauge of our mood, at the moment we walk out of our home.

Capture with Panasonic GF1 and 20mm/1.7 at Mandarin Oriental Dhara Dhevi, Chiangmai, Thailand.