The statement that is untrue about the sculpture is they were never completed and the reason is unknown.
What is the sculpture based on?
The sculpture in question is the section of the optical creativity that works in three dimensions and forms part of a synthetic arts.
These entails a strong sculptural methods that are used for carving and modeling,
Hence, the statement that is untrue about the sculpture is they were never completed and the reason is unknown.
Therefore, the Option D is correct.
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