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The Euro-logo is projected onto the main building of the European Central Bank, ECB during a rehearsal of the "Luminale" in Frankfurt/Main, Germany, on March 12, 2016. - The light festival "luminale" runs from March 13 to 18, 2016. (Photo by DANIEL ROLAND / AFP) (Photo credit should read DANIEL ROLAND/AFP/Getty Images)

The Euro-logo is projected onto the main building of the European Central Bank, ECB during a rehearsal of the "Luminale" in Frankfurt/Main, Germany, on March 12, 2016. - The light festival "luminale" runs from March 13 to 18, 2016. (Photo by DANIEL ROLAND / AFP)        (Photo credit should read DANIEL ROLAND/AFP/Getty Images)