In Walden Henry David Thoreau states,
Sometimes, when the ice was covered with shallow puddles, I saw a double shadow of myself, one standing on the head of the other, one on the ice, the other on the trees or hillside.
This was in a section where Thoreau was simply surveying the pond and describing things matter-of-factly, so I don't think it is meant to come across as symbolism.
I was hoping to find a possible explanation for this. Since he mentions this to happen only when shallow puddles are present, Perhaps it's a combination of reflection and refraction?