Honor. It's what powers Japanese culture. Some might think of the Japanese as historically over-concerned with shame, but shame is the result of losing honor or pride. And Shinto beliefs hold that everything in the world has a spirit.

If you're going to make a product, you can think of it as an inanimate cog in a machine that generates cash. Or you can think of it as a representation of your own worth, the worth of your company, and the worth of those who use it. If it's shoddy, that means you and your company are shoddy, and you think the users are too. And if it will have a spirit, you want to respect that spirit, as all spirits are connected in musubi.