 This lower hole also allows persons in the ambulatory to see through the altarpiece to the tabernacle, as if were transparent, so to speak.It was created in 1729-1732 by Narciso Tomé and his four sons (two architects, one painter and one sculptor).The use of light and of mixed materials (marble, bronze, paint, stucco) may reflect the influence of Bernini's Cathedra Petri in St Peter's Basilica, Rome.