Mathew points at himself in disbelief as Christ enters the room. Beams of light are cast onto those are the table, who are startled at the sudden disruption. This is the height of Caravaggios work with chiaroscuro, which in here prefigured the stark light-works of 1980s cinema. Pope Francis has said that he often went to San Luigi as a young man to commune with this painting. Referring both to Christ's outstretched arm and Matthew's response, Francis said, “This is me, a sinner on whom the Lord has turned his gaze”. Maybe.