The image of a giant ship floating in the sky might shock many, but it is a common occurance in places with layers of air that have varying temperatures. In a photo, Greek photographer Nontas Kalogiannis captured Achilleas, a massive freight ship, “floating” between Greece’s mainland at Kimi and Skiros, one of the area’s many islands, Daily Mail reported. The photo showcases Achilleas seemingly floating in the air just some feet above the waters, according to Daily Mail. The ship could be seen “floating” in the picture because of an optical illusion called Fata Morgana. Stephen James O’Meara, …