Sixteen silent minutes of March/April 1946 US Army footage showing some of the “atomic shadows” to be found near ground zero in Hiroshima. When the bomb went off, targets close enough were flash-fried by incredibly intense light; paint was very often burnt. But if there was something between the bomb flash and the surface, the surface would be “shadowed,” with the result that the part of the surface that did not see the flash did not get burned. In some cases the resulting shadows are incredibly distinct (in particular painted surfaces, where there is a substantial difference in brightness between raw and scorched paint), in other cases the shadows are more difficult to see (such as on concrete or stone).
At just before 10 minutes, you see an example where the shadowing object was a seated human.
[youtube sHF5y-lI2jw]
This phenomenon has been employed in scifi movies and TV shows from time to time. but they very often get things backwards… as in “Iron Man 3,” where some humans cast shadows on buildings due to very powerful explosions. But it’s the shadows themselves that are scorched black, not the surrounding area… which doesn’t make sense.