Some common examples of student created extensions are Warden organisms and SimCity-like structures, in which objects of certain types create objects of other types based on their neighbors (much like Conway's Game of Life).
A few other series have used the technology/magic combined motif, notably Apprentice Adept, another series by Piers Anthony, and Four Lords of the Diamond by Jack Chalker, although that book had an actual technological basis for the explanation of its magic, in contrast to Piers Anthony's work.
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