When does a stool become a chair?

What constitutes a stool and what constitutes a chair? Some say all stools are round, which is false. Some say only chairs have backs, which is also false. There are tall stools and short stools, as well as tall and short chairs, so height makes no differences. Both stools and chairs are made of the same materials.... show more What constitutes a stool and what constitutes a chair? Some say all stools are round, which is false. Some say only chairs have backs, which is also false. There are tall stools and short stools, as well as tall and short chairs, so height makes no differences. Both stools and chairs are made of the same materials. At what point does a stool become a chair and vice-versa? Please help.
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