Tag implication: keystone -> shimenawa

create implication keystone -> shimenawa

Link to implication

The shimenawa is literally how we know a keystone is a keystone. Without it, we could be looking at any old rock.

After this I also suggest keystone -> rock, the reason for which seems pretty straight forward. I would also suggest keystone -> shide but not as hastily. I see shimenawa does not implicate shide because (apparently) it is possible to have one without the other; however, I have yet to see a keystone without shide so I dunno.

Is it possible to make more then one implication per thread?

Is there a particular reason we've decided to use "keystone" instead of using the Japanese term for it? "Keystone" in English refers to something quite different, even if we're likely to never need to use it as a tag for the English meaning.

There are a few keystone images without any shimenawa.