Final answer:
The Roman building type that could be described as 'innovation by transposition' is the basilica.
Step-by-step explanation:
The Roman building type that could be described as "innovation by transposition" is the basilica.
The basilica was a versatile architectural type that had various functions in Roman society. It was commonly used as a law court or a meeting place for the town council. It was also often integrated into a forum square as a framing device.
For example, in the Forum of Trajan, the massive Basilica Ulpia bisected the complex, with the portico-lined courtyard lying to its east and the libraries and the Column of Trajan to its west.