Borrowing and Multiplying the Landscape

"Borrowing and Multiplying the Landscape" is the title of the work by French artist Daniel Buren.  It is in fact an enormous window (in the Turner Contemporary art gallery in Margate) through which you can see the sea, with mirrors on either side

I bought the postcard myself because I was so impressed by the original.  I've had it two years at least and only picked it out again because of the card from the German Bundestag has a very similar shape to the left of centre.  I've no idea what that shape is but it does look very similar to Daniel Buren's work.