Painting, sculpture and architecture are finished, but the art habit continues.
Artists themselves are not confined, but their output is.
Instead of causing us to remember the past like the old monuments, the new monuments seem to cause us to forget the future.
When a finished work of 20th century sculpture is placed in an 18th century garden, it is absorbed by the ideal representation of the past, thus reinforcing political and social values that are no longer with us.