The article describes a project where a rotary dial was integrated into a mechanical keyboard, allowing users to input numbers using the dial. The project involved hacking a cheap keyboard, using an Arduino to read the rotary dial's pulses, and 3D printing a shroud to hide the internals. The result is a functional, albeit slow, keyboard that can be used to input numbers. The project was intended as an April Fool's prank, but it has sparked interest and discussion about the potential uses and limitations of such a device.