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Building the Perfect Sand-Art Pen

Building the Perfect Sand-Art Pen

Austrian couple Benedikt Wurth and Rosi Binder have built the ideal sand art pen. Unlike sand pens already in existence, the Sand-Pen has a button which engages the built-in motor, allowing the sand to flow freely. Holding the pen close to a surface achieves fine line, while pulling the pen farther away gives a wider, more airbrushed look. I spoke with Benedikt about treehouses, tools, and his design process.