The other day I was giving a little tour to a group of Americans beginning with the magnificent Saint Maria Maggiore. You saw my photo of the mosaics a couple days back.
In the confession before the altar, where the relics of the manger of the Lord are preserved, there is a marble statue of Bl. Pius XI. He is in a cotta griccia. We had a discussion about what griccia is. Here is a great photo in marble.