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for exmple, i found this expression while reading a short ariticle.
... laer they realize that they are not just a flying stone. they realize that they are like a bird- they can fly. ( the writer isa skydiving teacher)
A flying stone would just go through the air then fall, while a bird can change direction, go up and down, etc.
Probably it means, they can do the actions on their own, like a bird which doesn't need an external help to fly. for a stone to fly, someone has to throw it.
does that sound fine?
flying stone? 
Linear Mode
