Double shadow, upside down!

November 2. 

August 16, 1854

Sailing past the bank above the railroad, just before a clear sundown, close to the shore on the east side I see a second fainter shadow of the boat, sail, myself, and paddle, etc., directly above and upon the first on the bank. 

What makes the second? At length I discovered that it was the reflected sun which cast a higher shadow like the true one. As I moved to the west side, the upper shadow rose, grew larger and less perceptible; and at last when I was so near the west shore that I could not see the reflected sun, it disappeared; but then there appeared one upside down in its place!

H. D. Thoreau, Journal, November 2, 1854

See August 16, 1854 ("At the steam mill sand-bank is the distinct shadow of our shadows, — first on the water, then the double one on the bank bottom to bottom, one being upside down, — three in all, — one on water, two on land or bushes.");October 18, 1853("Returning late, we see a double shadow of ourselves and boat, one, the true, quite black, the other directly above it and very faint, on the willows and high bank.") and August 31, 1852 ("I observe, on the willows on the east shore, the shadow of my boat and self and oars, upside down...")