In my training, they talk about three realities: personal reality, social reality, and the ultimate test of reality. Very simple:
In personal reality, I draw conclusions from my own experience. I saw a bear in our back yard, so I say, “there are bears — at least one — in our neighborhood.” That’s personal reality. (And yes, I did see one, years ago.)
In social reality, people agree. Others may have seen bears. Someone still might say, “they could all be mistaken,” but this becomes less and less likely, the more people who agree. (There is a general consensus in our neighborhood, in fact, that bears sometimes show up.)
In the ultimate test, the bear tears your head off.
Now, for the kicker. There is a bear in my back yard right now! Proof: Meet Percy, named by my children.
I didn’t say what kind of bear! Percy is life-size, and from the road, could look for a moment like the animal. (The paint is fading a bit, Percy was slightly more realistic years ago, when I moved in. I used to live down the street, and that’s where I saw the actual animal.)