As a child (and even now) I was always fascinated by the aeroplanes. Its sound made my neck turn and my eyes scan the sky, trying to spot the plane based on the auditory information gathered by my two ears.
The most amazing thing were those tiny looking toys disappear behind the clouds but still make the sound. I wondered how people sitting in it might feel and see when they disappear behind the clouds. Here is a glimpse of it - I happened to sit in one of them and see the earth disappear behind the clouds as my plane moved.
These clouds are supposed to compete with other clouds at a photography contest held @ http://www.cuckooscosmos.com/PhotoGallery/topic/