Because Niépce's exposure of Le Gras took about eight hours, during which the sun moved from east to west, the finished image appears illuminated on both sides of the building.
Sources
- History of photography | History, Inventions, Artists, & Facts - Britannica (britannica.com)
- https://www.historyofinformation.com/detail.php?id=3665 (historyofinformation.com)
- https://petapixel.com/the-first-photo/ (petapixel.com)
- https://www.hrc.utexas.edu/niepce-heliograph/ (hrc.utexas.edu)
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