This installation on the facade of the National Gallery of Bulgaria was short-lived but striking. For just over two weeks, from March 7-24, 2009, the display created by the Bulgarian artist Stephan Simov no doubt inspired many double-takes on Battenberg Square. (Since 1946, after the abolition of the monarchy, the National Gallery has occupied the former royal palace of Bulgaria in the capital city of Sofia.)

Thanks, Klearchos Kapoutsis on Flickr, for sharing these beautiful photos!