Boy this could go off on another tangent. Sound energy can be recorded, and animals react to sound energy. We don't know not can we prove what goes on in an animals head, I think it's sound for an animal, but we can't prove it . The recording of sound energy it only becomes sound after we hear it.
Neck knifes are another one of those things that I wouldn't use. Tucked in a shirt it's easier for me to grab a belt knife, outside the shirt it's in my way. Still some people like them, but I know of only one painting showing them. They don't show up in lots of paintings even if it's more then one, so I suspect they are more common today then then. We do however reinact a person living in the past, not people living in the past. That person may have wanted a neck knife, a sling, and heard a tree falling in the woods.
Neck knifes are another one of those things that I wouldn't use. Tucked in a shirt it's easier for me to grab a belt knife, outside the shirt it's in my way. Still some people like them, but I know of only one painting showing them. They don't show up in lots of paintings even if it's more then one, so I suspect they are more common today then then. We do however reinact a person living in the past, not people living in the past. That person may have wanted a neck knife, a sling, and heard a tree falling in the woods.