not a great article at all for those of us who have no preexisting idea what a polychrome wall actually is.
from wiki:
Polychrome is the "practice of decorating architectural elements, sculpture, etc., in a variety of colors."[1] The term is used to refer to certain styles of architecture, pottery or sculpture in multiple colors.
When looking at artworks and architecture from antiquity and the middle ages, people tend to believe that they were monochrome. In reality, the pre-Renaissance past was full of colour, and all the Greco-Roman sculptures and Gothic cathedrals, that are now white, beige or grey, were initially painted in bright colours. As André Malraux stated, "Athens was never white but her statues, bereft of color, have conditioned the artistic sensibilities of Europe... the whole past has reached us colorless."[2] Polychrome was and is a practice not limited only to the Western world. Non-Western artworks, like Chinese temples, Oceanian Uli figures, or Maya ceramic vases, were also decorated with colours.