An impossible object (also known as an impossible figure or an undecidable figure) is a type of optical illusion consisting of a two-dimensional figure which is instantly and unconsciously interpreted by the visual system as representing a projection of a three-dimensional object although it is not actually possible for such an object to exist.
Impossible Object
Halo Effect
An effect whereby the perception of positive qualities in one thing or part gives rise to the perception of similar qualities in related things or in the whole. An example of the halo effect would be judging a good-looking person as more intelligent. The term is commonly used in human resources recruitment. It refers to the risk that an interviewer will notice a positive trait in an interviewee and, as a result, will overlook their negative traits.
Television Stone
The locality of Boron, California, produces a most unusual form of Ulexite. Gigantic hunks of this mineral are found in great amounts in the form of fibrous, compact veins. When polished, these specimens become the famous ‘Television Stone’ sold to amateur collectors. The optical effect exhibited by Television Stone is caused by each of its individual fibers acting as fiber-optic cables, transmitting light from one surface to the other. Since all the fibers are parallel and compacted together, any image at one surface is transmitted through each fiber to the other surface. Thus, any text or image at the bottom of a specimen appears as if it is on top.




