In chelsea today I saw this smiley face made of glue.

Now, in order to fully appreciate the charm of this, you need to know that this was not a smiley face put on a wall for all to see. This was a person who's job was to glue posters onto walls, who chose to glue this poster by creating a smiley-face pattern on the wall with his or her glue.

It was not a public art statement, just a way of amusing himslef with his private glue face.

I also came upon this and thought a cool art project would be to stuff a building entirely with big brown paper so the windows all looked like this: