Two words — lawn dwarves. ;’)
Not to stir up a hornet’s nest, but decades ago, some genius at the British Museum decided that the Elgin Marbles (friezes that had been cut out of the Parthenon) needed to be sandblasted, because the statues should be pure white marble. So, the 2500 year old original paint job was removed.
The Parthenon must have been quite something in its original paint. The Romans decorated their buildings too, which I sometimes forget because a couple of thousand years has worn so much paint off.