[ Art of Google NYC ]
I love the art wall in Google's NYC office 9th Ave lobby. It is a matrix of vintage postcards that highlights famous buildings of the city as well as notes people have written on the back of the cards. It makes waiting for the elevators an enjoyable experience of exploration.
And then, at a certain point if you back up, you realize that these postcards are actually spelling out a word. Interesting tidbit: many people don't ever realize the subtle letters and word are there.