The Madonna of Luca della Robbia, to be offered at Sotheby's in early 2021: how she looks now and how she looked before restoration

The pre-sale estimate for the maiolica is impressive, with figures of up to a million dollars being mentioned. That is a good deal for polychrome glazed terracotta of the Quattrocento, but it should be remembered that the work belongs to the master who all but created the style, and this lunette with its devotional subject is, by and large, one of the founding pieces of an entire school. By way of comparison, a similar work by the younger della Robbia, Antonio, sold last year for £150,000 to £300,000, while a bas-relief by Luca and Andrea della Robbia, stolen from San Giovanni Battista in the 1970s, sold in 2011 for $350,000.

But the question is, by and large, not one of money but of the attitude to restoring works in such a state of preservation. The perennial dispute: to conserve or to restore, to retain the marks of age and the traces of an artwork's former life, or to give it the appearance of something new?

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Pope Leo XIV on the courage to do good, to forgive and to enter into dialogue

Our time needs men and women who have the courage to do good, even when it involves sacrifice. Draw near to those who are lonely, support the weary and seek out those who have lost their way. Have the courage to forgive, to begin anew and to enter into dialogue.

Old colour photograph with cracks: adults and children resting on the grass on a slope under a tree.

Orientalist Grigory Kozakov with relatives and children at a picnic near the village of Zhikharevka in 1903

The Orientalist Grigory Alexandrovich Kozakov, surrounded by his relatives, his daughter-in-law Countess Anna Nikolayevna Tolstaya, the children and their tutor, at a picnic near the village of Zhikharevka in 1903

Konstantin Ivanov's Cosmonautics Day poster, published in Moscow in 1977

Grow strong, cosmic youth! A poster for Cosmonautics Day, created by the artist Konstantin Konstantinovich Ivanov in 1977. The work was issued by the Moscow publishing house “Plakat” for 12 April. Konstantin Ivanov was a Soviet graphic artist and poster designer, Honoured Artist of the RSFSR. The theme of space

Signs of violent death found on skulls from burials beside the royal tombs at Abydos

An American archaeologist has carried out a forensic analysis of skulls of people who were buried beside the tombs of Egypt's first kings at Abydos, and has found on many of them traces of violent death. Abydos in Upper Egypt served as the burial place of the kings

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Pope Leo XIV on the courage to do good, to forgive and to enter into dialogue

Orientalist Grigory Kozakov with relatives and children at a picnic near the village of Zhikharevka in 1903

Konstantin Ivanov's Cosmonautics Day poster, published in Moscow in 1977

Signs of violent death found on skulls from burials beside the royal tombs at Abydos