The six glorious scenes that make up the Triumph of the Eucharist series by Peter Paul Rubens (1577-1640) are highlights of the Museo Nacional del Prado's superb collection of Flemish paintings. Completed in 1626, these brilliantly detailed sketches were painted at the behest of the Infanta Isabel Clara Eugenia in preparation for a series of monumental tapestries that are now considered among the finest made in Europe in the seventeenth century. Unfortunately, additions to the wooden supports, introduced after the paintings were created, made the panels considerably larger than Rubens...