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This is a European Union poster used to promote European unity. It's modeled on Pieter Brueghel's famous 16th century painting "The Tower Of Babel". The poster shows the peoples of Europe rebuilding the tower that God condemned in Genesis 11:

"And the LORD came down to see the city and the tower, which the children of men builded. And the LORD said, Behold, the people is one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do. Go to, let us go down, and there confound their language, that they may not understand one another's speech. So the LORD scattered them abroad from thence upon the face of all the earth: and they left off to build the city. Therefore is the name of it called Babel; because the LORD did there confound the language of all the earth: and from thence did the LORD scatter them abroad upon the face of all the earth." (Genesis 11:5-9)

Note the statement shown on the poster "Many Tongues One Voice" inverts God's judgement on Babel. Note also that each of the normal European stars have been slightly rotated to form pentagrams which shows the horns, ears and beard of Lucifer.