The relativity of time
TIME HAS A DIFFERENT PACE WHEN YOU HAVE YOUR HEAD IN THE CLOUDS
Balloon moves with the speed of the wind, so when you are in its basket you feel as if you were standing still and it was the cityscape of Warsaw below that was moving. The relations between sensory perception and rational thinking are an outcome of the relativity of the systems in which we exist.
As we are flying, many more associations about the relativity of time come to our minds, some of them not really connected with our senses.