It's not always negative, either. When you're familiar enough with your fellows, you can perceive when something good has occurred as well. There's an excitement in the air, the room seems lighter somehow.
This ability of people to notice things is not limited to just being able to "pick up" others' feelings. One can walk into a building and notice immediately that there's something "off", or, on the other hand, one can feel a bit of a pick up without really putting their finger on it. It's true. It's not always a smell, dirt, stuffiness or anything firm. But it's there. And it's real.
We're talking about something practical, nothing mysterious or magical.
In our 30 years' of business we've learned many things, but two of them stand out. First, we have learned that "It's all in their heads" is a phrase normally bandied about by those who would rather not listen. It is NOT just in their heads! We used to feel that way, but through hard experience we have found that in 90% of the cases when someone says, "there's something wrong with the air in here", there is something wrong with the air! Aside from the rare individual whose whole purpose in life is to make others' lives miserable, the vast majority of people don't make this stuff up.