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...it's a map of Europe made out of window boxes. There was a sign below it saying a bit about each of the types of plant used, although I didn't manage to establish whether each one was supposed to be native to the region which it shows on the map.
UTC Time: 07:39, Monday 21 June 2010
Local Time: 09:39, Monday 21 June 2010
Estimate of longitude: 12° 35' 11.44" E = 12.586510°
Estimate of latitude: 55° 40' 51.78" N = 55.681050°
Possible error on position estimate: 5 metres