It happens that I feel neutral after a lesson. I just leave the classroom without any particular emotions. My barometer reads zero. A few minutes later I come back to collect something I forgot on the desk and I find a scribble on the board. At first I'm a bit disappointed that the kids haven't cleaned the board but when I look closely I can read the following sign: 'We enjoy learning English'. And at that moment a feeling of happiness floods in and the position of the indicator hand of my barometer changes rapidly; the pressure goes up and my energy level is high again. I think: 'Wow, it's great to be a teacher!'