A model train going around a track enters a small tunnel and something odd happens.  The train does not emerge from the other side like your mind would tell you that it should.  In fact, the entire train seems to disappear into the tunnel even though the train is significantly longer than the tunnel itself.  […]

In the late 19th and  early 20th centuries, it was a common practice for cigarette companies to include cards with their products to help advertise their brand.  Ogden’s Cigarettes, a branch of the Imperial Tobacco Co. (of Great Britain & Ireland) Ltd, released a series of 25 optical illusion cards in the 1920s.  Number 13 […]

Joaquim Alves Gaspar captured this photograph of a man walking in a tunnel holding a camera.  The picture was taken at São Martinho do Porto on the west coast of Portugal.  It is uncertain whether the man is approaching the camera or walking away from it.  Can you tell? This picture was found on Wikimedia […]