British Museum

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A British Museum representative poses for photographs next to "Flag I" by Jasper Johns which features in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to an illuminated American flag at the entrance of "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to Roy Lichtenstein's "I Love Liberty" which features in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to Andy Warhol's "Marilyn 1967, 10 Color Screenprints" which feature in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to Robert Rauschenberg's "Signs", 1970, which features in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to "Vote McGovern" by Andy Warhol which features in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to an illuminated American flag at the entrance of "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to Andy Warhol's "Mao", left, and Jim Dine's "Drag: Johnson and Mao" which feature in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to "Standard Station" by Edward Ruscha which features in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to "Flag I" by Jasper Johns which features in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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A British Museum representative poses for photographs next to "Vote McGovern" by Andy Warhol which features in "The American Dream: pop to the present" exhibition during a media photocall at the British Museum in London, Monday, March 6, 2017. The exhibition, which opens to the public from March 9 and runs until June 18, charts modern and contemporary print making. (AP Photo/Matt Dunham)

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Members of the media stand around the Mummy of Tamut, a temple singer around 900 BC, during a press conference at the British Museum in London, Wednesday April 9, 2014. Scientists at the British Museum have used CT scans and volume graphics software to go beneath the bandages, revealing the skin, bones, internal organs, and in one case a brain-scooping rod left inside a skull by embalmers. The results are going on display in an exhibition which sets eight of the museum's mummies alongside detailed 3-D images of their insides. (AP Photo/Alastair Grant)

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Members of the media stand around the Mummy of Tamut, a temple singer around 900 BC, during a press conference at the British Museum in London, Wednesday April 9, 2014. Scientists at the British Museum have used CT scans and volume graphics software to go beneath the bandages, revealing the skin, bones, internal organs, and in one case a brain-scooping rod left inside a skull by embalmers. The results are going on display in an exhibition which sets eight of the museum's mummies alongside detailed 3-D images of their insides. (AP Photo/Alastair Grant)

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The Mummy of Tamut, a temple singer around 900 BC, is shown during a press conference at the British Museum in London, Wednesday April 9, 2014. Scientists at the British Museum have used CT scans and volume graphics software to go beneath the bandages, revealing the skin, bones, internal organs, and in one case a brain-scooping rod left inside a skull by embalmers. The results are going on display in an exhibition which sets eight of the museum's mummies alongside detailed 3-D images of their insides. (AP Photo/Alastair Grant)

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The Mummy of Tamut, a temple singer around 900 BC, is shown during a press conference at the British Museum in London, Wednesday April 9, 2014. Scientists at the British Museum have used CT scans and volume graphics software to go beneath the bandages, revealing the skin, bones, internal organs, and in one case a brain-scooping rod left inside a skull by embalmers. The results are going on display in an exhibition which sets eight of the museum's mummies alongside detailed 3-D images of their insides. (AP Photo/Alastair Grant)

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The Mummy of Tamut, a temple singer around 900 BC, is shown during a press conference at the British Museum in London, Wednesday April 9, 2014. Scientists at the British Museum have used CT scans and volume graphics software to go beneath the bandages, revealing the skin, bones, internal organs, and in one case a brain-scooping rod left inside a skull by embalmers. The results are going on display in an exhibition which sets eight of the museum's mummies alongside detailed 3-D images of their insides. (AP Photo/Alastair Grant)