This will be a repeat of a talk I gave in Regina in August 2012 and in a number of other places, and I plan to repeat it a good further number of places. Though here at the Newton Institute I plan to make the talk a bit longer, giving me more time to give some further fun examples of meta-structures, and perhaps I will learn from the audience that these meta-structures should really be called something else. The slides of the talk are availble here: http://www.math.toronto.edu/~drorbn/Talks/Newton-1301/#Talk2.
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