Continuing with the theme of painted architecture and sculpture, a reminder that Greek temples and sculptures were always painted and sometimes gold-leafed too. All flaked off except for microscopic residues.
The Roman admirers of Classical Greece did not get that memo, and the Renaissance sculptors didn't either.
Probably because of that historical error, much or most stone and metal sculpture has been unpainted since the Renaissance. To modern eyes, the Pieta would look pretty nasty if painted in lifelike colors but the Greeks would have figured it was waiting for the paint.
Parthenon Once a Riot of Color
Below, the likely appearance of the Parthenon frieze