One thing is now certain: the Ichnographia Campus Martius, as printed by Giovanni Battista Piranesi, exists in two states. The difference between the two states involves changes to the plan formations of all the circuses delineated throughout the overall large plan. The first state complies with all the other textual and graphic information regarding the circuses featured within the Il Campo Marzio dell'Antica Roma publication. In the second state all the circus plans are changed to match the design of the Circus of Maxentius on the via Appia.
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