Scott McCoskery spent 20 years in meetings clicking a pen or opening and closing a knife. At some point, he came up with an idea to build a tool designed simply to keep his hands busy, something personal and sturdy and small enough to slip in a pocket.

He experimented with a few prototypes. He made dozens, and tested dozens, and discarded dozens, until he settled on a device that, to him, was perfect: a metal gadget with two round arms and a central ball bearing, round like the a smoothed-down button of a jean. The device looks like a missing machine part until it hits a finger, and awakes.

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