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After spending the time reading 8 pages of this, I feel like I have enough time invested I have to comment, if not contribute.
To figure out if an unused knife is a knife or something else we need to define what a knife is first. A tool used to cut seems to be the basic definition, but scissors and axes cut, and they arent knives ( though would half a scisssor be a knife?) nor are saws, shovels or jackhammers, and they all cut too.
So do we go with the supreme court porn v art definition of knives, in that I know one when I see it? Not a great definition, as trainers sure look like knives (porn, in this example) but surely arent.
Speaking of trainers, Im pretty sure you wouldnt be able to carry those onto an airplane or into a courtroom either. Same with rubber training guns, but no one would call those a firearm either.
To me, a knife is a knife when it gets used as a knife, not unlike leghog. If it hangs on a wall or in a safe, it might as well not have an edge and be an art piece trainer, because its proved its worth even less than a rubber trainer thats been used. It might be rusted to hell somewhere you cant see, or have a bad heat treat, or whatever, and as soon as you would count on it to save your bacon the rubber trainer would have been more useful.
Its kinda schoedingers cat of sharp things.
So you two are basically making up your own definitions as you go along...

What if it hangs on the wall and does have an edge is it still not a knife?
Talking about an object designed to be a wall hanger, if it has all the attributes of a knife and among all the objects in the world, it has features similar to a knife then it is a knifelike object. It is called a knifelike object because it recognizably has the features of a knife. I'm sure any 6 year old can identify what a knife is. Unless of course, it is something else disguised as a knife.
While Schrodinger's cat may not be easily identified as alive or dead, he is still obviously a cat.

If I have a knife I used for a year or two, does it stop being a knife if I stop using it? Or does using a knife once make that object a knife forever?
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