This mind-bending World War II photograph with “floating trees” may look like it is an optical illusion or cloned on Photoshop — but it is actually a real image. In the surreal image, which is part of the Finnish Defence Forces’ photographic archive, a Finnish army car drives along a road, a few miles from the border with the Soviet Union. Above the vehicle, a line of mysterious pine trees eerily levitates in the air. The picture was taken in 1941 by a Finnish photographer called Osvald Hedenström, as his nation tried to shield itself from neighboring Stalinist Russia during...