It quickly swelled into the shape of a gigantic question mark, the middle of
which was a vivid crimson, and as this
thunderhead-like column billowed upward through the sky, she could
see a red ball of fire at its core.
- Hiroyuki Agawa Of the atomic explosion, Hiroshima.
Haru no shiro (Citadel in Spring,
translated by Lawrence Rogers), ch.9.