Human: Write a detailed description of a warm desert scene with sand dunes. Assistant: 
Giant dunes perspire fine lines of sand down their sloping sides as if in reaction to the sun's overwhelming heat. The real culprit, however, is likely a simple combination of gravity and wind. Regardless, the mounds slowly fade into the background, diminished by their own dusty sweat, only to be rebuilt by the next heavy, replenishing gust.