Many thanks to VentnrBlog reader, Philip Marsh for sending in this photo he took on Monday morning from Wheelers Bay.
Philip believes that this may be a mirage created by a layer of cooler air over the sea and could be a dock in France.
Apparently something similar has been reported in The Times, but Philip tells us that this is the first time he has seen it.
Perhaps you, dear reader, have other suggestions? Have you seen the same? Leave us a comment and let us know.