Human: Make a concise location description of a cold scene outside a wilderness mountain with snow, a boulder, and a trail. Assistant: 
Delicate snowflakes dance in the air, swirling. A large boulder has broken off from the mountainside and now sits upon the shelf, blocking the trail. Crowned with a layer of snow, the boulder nearly touches the slope rising up at its side. Only a slim crevice between the two allows passage beyond.