"The most distinctive characteristic of Lull's Art is clearly its combinatory nature, which led to both the use of complex semi-mechanical techniques that sometimes required figures with separately revolving concentric wheels - volvelles - and to the symbolic notation of its alphabet. These features justify its classification among the forerunners of both modern symbolic logic and computer science, with its systematically exhaustive consideration of all possible combinations of the material under examination, reduced to a symbolic coding" (DSB VIII, p.549). This copy does not appear to have any volvelles, but clearly if the illustration on p.741 were to be cut out and placed on that at p.746 the example illustrated in DSB would begin to become apparent.
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