The Holy Father celebrated Holy Mass with members of the Pontifical Theological Commission.
Mass was in the Pauline Chapel in the Apostolic Palace.
Mass was ad orientem, at an altar which can be used from either side.
Since this was for the theological commission, perhaps the Holy Father was also saying something theological by a choice he knew would be widely discussed.
What do you think?
No matter what, it is nice to see the Roman Pontiff celebrating ad orientem versus.
Brick by brick, friends.
Turn by turn.
Altar by altar.