Andrea Pozzo, Trinity Altarpiece: Detail, the Trinity

By the later 17th century, this had become the most common way of representing the Trinity: the Son and his cross on the right, the Father on the left, and the Holy Spirit above and between them, emanating rays of light on both. The mappa mundi orb between the Father and Son is usually much smaller and placed in the Father's left hand.

The altarpiece is by Andrea Pozzo, this sculpture by Leonardo Reti and Lorenzo Ottoni.

View the entire altarpiece.
Read more about the Trinity.

Photographed at the church by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.