We thank G

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A stairway in the Amsterdam Museum of Photography "Huis Marseille".
Someone has carefully lettered a message on the wall, maybe explaining something about a picture nearby. Someone else has rushed to wash off most of the message. The word 'Russia' is barely legible along the remaining smudges but part of the message survived.
"I thank G"
Who is G? What has G done for us? We don't know but it's the best sign I've seen in the museum today. Thank you G! Thank you!! 

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