When you first encounter Edvard Munch's most famous painting, The Scream, you focus on the person screaming. But what's going on in the background? Is that wavy technicolor sky something he observed, or something he imagined?
Munch painted four version of The Scream between 1893 and 1910. Those who've studied Munch's work have connected it with his 1892 diary entry in which he described his feeling of angst at seeing "The flaming clouds like blood and swords". The passage could be from his imagination, but it could also be a real meteorological phenomenon he witnessed. Maybe it was a spectacular burst of sunset color caused by a volcanic eruption, maybe the 1892 eruption of Indonesia’s Mount Awu, or more likely the 1883 eruption of Krakatoa. But in 2017, three Norwegian researchers offered a theory involving nacreous clouds, that only happen during rare and very particular weather conditions.
You can see the resemblance, right? Read about nacreous clouds and The Scream at Mental Floss.
(Cloud image credit: Cepstral)