Michelangelo sculpt the mother figure in his Pieta as a young woman as it is an important work that balances the Renaissance ideals of classical beauty with naturalism.
this is likely an example of CULTURAL EXCHANGE.
Cutural exchnage is the process whereby one culture adopts traits of another culture, it could be in form of language, food, clothing, Arts, Architecture, music, dance etc. It can also mean mutual sharing of information between two or more species/people for the purpose of improving friendship and understanding between them.
An example is the Pizza, it is originally from Italy, however, today we have the American pizza, which is made in a similar style with their Italian counterpart.
It is an example of geometric sculpture form because it has been formed in geometric shapes and organized in a non organic manner