thank you all

The image of an intrigue, which appears to the spectator in order that he imagines the rest of the history to his own taste. Good work.

thanks
It is actually Micha Ulmann's inverted statue in Berlin as a memorial to the
"German Kristallnacht-cristal night- in november 9 1938 when the nazies burned all jewish books.
What you see here is an underground room with empty shelves - no books,
coverd by glass that reflects the sky which is the only thing left.
At night the room is illuminated and the shelves can be seen sharply