● The participants sit in a circle ● 2 of them volunteer to go to center and each of them has to think in 1 problem and 1 object (the 2 cannot be related) ● One of the 2 will start by saying his object and the other its problem. The participant with the object has to solve the problem with his object ● Then the other way around ● Two new participants do the same until all the participants have played