Knot is a robotic offcut piece of scrap lumber.
Knot represents what is arguably the final evolutionary form of a spare bit of 2x4 lumber. By hollowing out the wood, it can be filled by a RedBoard Artemis, the board for which this sketch was written, two stepper motor controllers, and two stepper motors. The whole thing is designed such that all this tech is hidden when the robot is viewed from the top, meaning it just looks like a normal piece of non-robotic wood when viewed from that perspective. The robot is controlled by tapping on the top of the wooden chassis. One tap moves the robot forward, two taps turns right, three turns left, and four moves the robot backward.
Instructions for building the robot can be found on Instructables.