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line of semtry
Because they don't create a perfect 'mirror image' of each other
This is referred to as bilateral symmetry, for instance the human body whose left side is more or less a mirror image of it's right side (on the exterior, that is).
Yes, most of them are as if you cut the chair in half both pieces will be mirror image of each other.* * * * *True, but that is a kind of tautological answer. It does not work if you cut it in two along a vertical plane parallel to the back: one part will have the front legs and a bit of the seat while the other will have the back legs, rest of the seat and the back. Not a mirror image. It will work, but only if the chair is cut by a vertical plane that is perpendicular to its back.