Uploaded on 2015-06-30 by AndreeaFulger

[1]: https://edxuploads.s3.amazonaws.com/14357065122637422.jpg This is a photo taken in Barcelona last summer. It shows the Jean Nouvel Tower illuminated at night and the little park that is next to it with the coloured seats. The first invisible information is how long the lighting of the tower lasts, does it change color and the second one would be which seat do you prefer? It would be possible to change the color of a seat according to the preference of the user should his/her favorite color happen to be taken.