From which unique vantage point does thoreau initially describe the pond
• from the sky
• underwater
• in the dark
• upside-down

The unique vantage point that Thoreau initially uses to describe the pond is upside-down.
Not many people would use this vantage point to describe anything, let alone a pond in nature. However, Thoreau wanted to stand out from the crowd, and used it beautifully, which only added to the entire effect of wonderful nature and the pond.

Only if that could happen to everyone