Mystery over Christ’s orb in $100m Leonardo da Vinci painting

Crystal sphere in Salvator Mundi artwork lacks optical exactitude, prompting experts to speculate over motive and authenticity

A new biography of Leonardo da Vinci has raised “a puzzling anomaly” in a rediscovered painting that is estimated to fetch $100m (£75m) at auction next month.

Related: Only Leonardo da Vinci in private hands set to fetch £75m at auction

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