UFO. United States

This version can refer to any observation in the contrast of an object on a solid background, both day and night.

Night it can be a light in a dark house, on the technique in a dark room, etc.

Day the color of the sky sometimes merge with the color of the surface of the Earth at the horizon level. While it may seem that the object on this piece, floating in the sky. It is clearly seen, for example, at the marine landscapes. This illusion may occur as in the photos (especially black and white) and by direct observation.

Most often this artifact is called skayfish if the lens gets a passing bird or insect. It is based on the discrepancy between the speed of the video and the frequency of the flapping of insect wings. Essentially, each video drops a few strokes of the wings of an insect, which when viewed looks like "arrow", provided with long protuberances. The motion of the insect by its translucent body seems to "boom" and vibration of the wings give the appearance of bumps.

When the objects are out of focus, their silhouettes blurred and poorly recognizable. They can look like dark or colored translucent stain. This is often the cobwebs, spiders, insects in front of the camera.