Samurais are a resourceful bunch, roaming the country looking for freelance work. So it's no surprise they've come up with a really simple way to keep books on a shelf from falling over: just stab them all through the heart with a sword. Or at least we're assuming that's how this Katana Bookend from Mustard works.
It could also be just two halves of a fake sword attached to heavy faux books that sit on either side—and blend in—with your own collection. But the first explanation is probably the more enjoyable way to describe it to your friends in May when you can pick one up for $30, shelf and other books not included. [Mustard via bookofjoe]