Can you spot the 'error' in this Da Vinci painting that is puzzling experts?
A tiny detail in a Leonardo Da Vinci portrait is baffling experts, with some saying its an "error" in the $125 million painting.
The Salvator Mundi (Saviour of the World) painting, on display at Christie's Auction House in New York, is expected to fetch $125 million at auction next week.
The artwork depicts Jesus holding a crystal orb in his left hand.
The painting was declared authentic in 2011, but a recent study has raised question about why the orb is see-through with no distorted light.
“Solid glass or crystal, whether shaped like an orb or a lens, produces magnified, inverted, and reversed images," writer Walter Isaacson told The Guardian.
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"Instead, Leonardo painted the orb as if it were a hollow glass bubble that does not refract or distort the light passing through it.”
He said at the time Da Vinci did the painting, he was "obsessing" over his studies of light refraction.
Mr Issacson said the artist had a notebook full of drawings of light bouncing off surfaces.
He said he could not be "absolutely sure" the painting is authentic.
This comes after ArtWatch UK director Michael Daley described the Salvator Mundi as "deadpan" and "uncharacteristically cropped."
A spokesperson from the auction house said: “Leonardo’s paintings are known for their mystery and ambiguity".
