"Whether a person will die or not" is relative Barn and pole paradox is a famous controversial topic. (IMHO, Barn and pole is not paradox. There's no paradox in this universe.) However, if the case is modified as follow: Imagine that the two barns become two big sharp knives, and they are separated by a distance of 1.5 meters. The pole becomes a human who is flying like the person in rocket man movie. His speed is 0.8c Now, assume that the front knife and back knife is cutting down and up on a table with same frequency. The rocket man body is also 1.5meter long. When he's flying above the table in order to pass through the knives, he will find that the distance between two knives relative to himself to be: 1.5meters x squareroot(1-(0.8c^2)/c^2) where c is speed of light = 1.5meters x 0.6 = 0.9 meter Distance between two knives is much shorter than his body so he'll possibly die. Whereas, for a stationary person (say Mr. X) who is just standing still relative to table, he'll find that the rocket man body length is 0.9 meter, so the rocket man will not be cut into pieces. Now, the next point is that if I want the rocket man die, I need not kill him directly. But I just act like a rocket man to fly in the same speed at somewhere else. Then my wish can come true. Furthermore, after I finished flying trip and saw rocket man being cut into pieces, I asked Mr. X if the rocket man died. What would he answer ? I think he would also answer me that the knives cut the rocket man and he would also claim that the space distance between two knives was shorter than the rocket man. Therefore, reality must also be relative according to different reference frame. But this is too hard to imagine though it can be understood by theory. Anyone has similar feeling?