Magic mirror

This graphic perspective system was transposed into a magical context by John Dee who believed that pictures drawn according to the single-point perspective system could become a type of magical mirror. Dee produced his own treatise on perspective which is found... 

We have to look at real-world positive behavior as opposed to normative behavior. For organizations the true test of a model is not how well it works, but how well it is used. There are a number of very good reasons why organizations behave very irrationally with respect to their investment in models. There are three examples of this poor behavior the golden goose, the magic mirror, and the stone soup. 

Then there is the magic mirror. You can stand in front of the magic mirror and ask it to make predictions What am I going to look like 5 years from now if my lifestyle remains the same What am... 

B. Ernst, The Magic Mirror ofM. C. Escher, Ballantine Books, New York, 1976. 

Youngblood, Denise, The Magic Mirror Moviemaking in Russia 1908—1918 (Madison, WI University of Wisconsin Press, 1999). 

Michelspacher s four mirrors in the Cabala (1615—16) may have originated in Dee s optical magic in the Propaedeumaia Aphoristica (1558). He employs these ideas in a polemical manner to defend Paracelsians against Roman Catholics and Lutherans. The essence of Michelspacher s political position is displayed in the fourth engraving of the Cabala,... 

The Nyquist stability criterion is, on the surface, quite remarkable. We are able to deduce something about the stability of the closedloop system by making a frequency response plot of the openloop system And the encirclement of the mystical, magical (— 1, 0) point somehow tells us that the system is closedloop unstable. This all looks like blue smoke and mirrors However, as we will prove below, it all goes back to finding out if there are any roots of the closedloop characteristic equation in the RHP. 

Seligmann, K. The Mirror of Magic. New York, 1948 rpt. Magic, Supernaturalism, and Religion. New York Pantheon, 1971 [edition cited here]. 

I moved a chair over to the big mirror in the wall of books. Mirrors themselves are no more magical than crystal balls, but both can be used for occult purposes, like the piece of chalk I used to draw a pentacle around myself and the chair. I sat down, tried some deep breaths, and then uttered my first call, summoning Putrid (not his real name) to be manifest in the mirror before me. 

A reflection is an operation that changes the sign of an odd number of coordinates. It is discontinuous that is, it cannot be carried out in a continuous manner without distortion of the object, and it is a purely mathematical operation that cannot be physically performed. For example, consider reflection in Euclidean 3-space (7 3) If the mirror occupies the yz plane, then a reflection sends each point from (x,y,z) in front of the mirror to ( x,y,z) in the magic land behind the looking glass. The relationship between an object and the image in the mirror thus acquires a mysterious quality, for the reflection that we see in the mirror is intangible and has no existence in our world. 

I contemplated it [the poem] as it were in a mirror which, as we know from experience and more recently by entoptics, has the ability to exert a magical influence. Here, in a much more formed language, I saw my feelings and... 

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