The name of DouglasHofstadter's column in the magazine ScientificAmerican published from circa 1981. 
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The name is remarkable because it is an anagram of MathematicalGames, which was the name of the same column when MartinGardner was writing it. A book of almost the same name:

''Metamagical Themas: Questing for the Essence of Mind and Pattern'', 

http://images.amazon.com/images/P/0465045669.01._PE_PI_SCMZZZZZZZ_.jpg
[ISBN 0465045669] collected the columns and, I think, some related material that did not make it into ScientificAmerican. The book is a collection of DouglasHofstadter's columns, each paired with a reflection on the column written by Hofstadter. I am under the impression it was published in order to maintain his public presence while he worked on other books -- I seem to recall his writing something to that effect in his LeTonBeauDeMarot.