The focal point of the church is the place where Christ’s sacrifice is commemorated. The Lord gives himself to us with his body and blood, kept in the tabernacle. On a slightly higher level than the nave, so that it can be easily seen by all, the altar was made completely of marble by the sculptor Flaminio Del Turco in 1608 on a commission from the Sienese nobleman Cristofano Chigi. In the upper . . .