Common Sense

The Japanese concept of Joshiki is translated as "common sense" but I think a better choice is "group sense". Joshiki is the unspoken way all things in Japan are done from riding a bike to forming a government. This unwritten code is somehow propagated to all Japanese so they know how to behave in any situation with other Japanese.

It's everywhere, underlying all actions, kind of like The Force except you can't use it to choke people who mock your belief in it.

The inability to use this sixth sense is what I think makes it hard for Japanese to communicate with people from other countries, more than language skills do.

Fortunately, even in the absence of a Jedi master, it seems Joshiki can be cultivated through the study of Aikido.