The Mission Dolores mural is one of the best preserved pieces of indigenous painted art from the period of first contact with Europeans. Using indigenous materials, the native Ohlone artists produced a mural in 1791 which is a graphic representation of the way in which Catholicism in the California missions were filtered through indigenous beliefs. In 1796 the current altar was placed directly in front of it and very soon the mural was forgotten.
Work that I did in the early 2000's resulted in the first systematic photography of the mural. I was able to stitch these photographs together and project images of the mural onto the inside of the dome at the Mission Dolores Basilica.
The mural was first discovered during an early 20th century renovation of the altar by an Irish Catholic Fennell family.
Source: Ben Wood