And since they were fanatics, he says, proposing via the tiny boxes of a crossword puzzle "was a more natural idea than it might seem to others."

因为两人都是填字游戏的狂热爱好者，他说，所以通过那些小小的填字格求婚“在其他人看来或许不可思议，对我俩来说却是自然不过的事情。”

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So to facilitate the training of camp attendees (and design engineers) next summer, I purchased many different puzzle boxes in Hakone to use as teaching tools.

FORBES: Japanese Secret Boxes: The Coolest Security Puzzles for Kids and Adults

My colleagues and I used puzzle boxes to show these kids what we do for a living, and more to the point, to engage their minds.

FORBES: Japanese Secret Boxes: The Coolest Security Puzzles for Kids and Adults

That process requires a very different kind of thought process and one which I developed as a child when I discovered puzzle boxes in Chinatown in San Francisco.

FORBES: Japanese Secret Boxes: The Coolest Security Puzzles for Kids and Adults