If you are a lover of paper diaries you should consider this playful one diary 2011 di Swiss Julie Joliat with more than 50 puzzle.
Psychic Factory: Droplet Traffic Light
The "traffic light drop", a new project psichicfactory envisions a future in which the waiting time at the red light is not wasted time. The device is modeled on the style of a traffic light. After becoming red, its LED display turns and