There's no need to be scared, though. The spooky apparition has been created with some clever visual trickery, as part of the Amsterdam Light Festival.

Ghost Ship, as is its perfunctory title, is located off the island of Oosterdok in front of the Amsterdam Center for Architecture (ARCAM) and the National Maritime Museum. Produced by Romanian collective Visual Skin, the illusion is created by projecting an image onto two intersecting perpendicular screens of water. The ethereal installation will not be setting sail anywhere, but wavers and flutters eerily in the wind.