The frescoes painted inside Villa Valmarana ai Nani by Giambattista and Giandomenico Tiepolo have been studied by many scholars, such as P. Molmenti (1881), H. Modern (1902), E. Sack (1910), G. Fiocco (1926), W. Arslan (1936), H. W. Hagelmann (1940), M. Goering (1942), R. Pallucchini (1944).
In particular, in 1941 the art critic Antonio Morassi definitevely acknowledged the authorship of the frescoes, starting from the profound differences between the subjects represented in the Palazzina and in the Foresteria.
He realizes that the year written in the cartouche of the fresco called “Mondo Novo”, painted in the Foresteria, is 1757 and not 1737 (as wrongly believed until then). Giandomenico Tiepolo was born in 1727, hence he could not have been working together with his father Giambattista in 1737. In 1757, instead, he was 30 years old and capable to paint that masterpiece.