Rotating several kinds of gear wheel along with guide rail, this ruler enables us to draw beautiful patterns. For kids, it is like a magic.

In my child era, with betting sweets for the day, I had some matches with my elder sister “Who can draw more beautiful pattern”.
But because the judge was her, so I never win obviously.

Even after grown up, I wonder why this can make patterns.
Good toy. It stirs up kid’s curiosity.

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