the Resurrection of the Son of Theophilus, he painted a pavement in perspective, framed by large buildings to obtain a three-dimensional space in which the figures are placed proportionate to their surroundings. In this he was a pioneer in applying the newly discovered rules of perspective. In September 1425 Masolino left the work and went to Hungary. It is not known if this was because of money quarrels with Felice or an artistic divergence with Masaccio. It has also been supposed that Masolino planned this trip from the very beginning, and needed a close collaborator who could continue the work after his departure. But Masaccio left the frescoes unfinished in 1426 in order to respond to other commissions, probably coming from the same patron. However, it has also been suggested that the declining finances of Felice Brancacci were insufficient to pay for any further work, so the painter sought work elsewhere. Masaccio returned in 1427 to work again in the Carmine, beginning the Resurrection of the Son of Theophilus, but apparently left it, too, unfinished, although it has been suggested that the painting was severely damaged later in the century because it had contained portraits of the Brancacci family, at that time excoriated as enemies of the Medici. This painting was either restored or completed more than fifty years later by Filippino Lippi. Some of the scenes completed by Masaccio and Masolino were lost in a fire in 1771; we know about them only through Vasari's biography. The surviving parts were extensively blackened by smoke. In the twentieth century, the removal of marble slabs covering two areas of the paintings revealed the original appearance of the work. Pisa Altarpiece On February 19, 1426, Masaccio was commissioned by Giuliano di Colino degli Scarsi da San Giusto, for the sum of 80 florins, to paint a major altarpiece, the Pisa Altarpiece, for his chapel in the church of Santa Maria del Carmine in Pisa. The work was dismantled and dispersed in the 18th century, and only eleven of about twenty original panels have been rediscovered in various collections around the world. The central panel of the altarpiece (The Madonna and Child) is now in the National Gallery, London. Although it is very damaged, the work features a sculptural and human Madonna as well as a convincing perspectival depiction of her throne. Masaccio probably worked on it entirely in Pisa, shuttling back and