You may wonder how writing on a piece of paper gets transcribed onto your digital screen. It’s all between a pen and a surface with a special kind of sensor. In Wacom’s case, which powers the Lenovo Yoga Book’s Create Pad, there’s a chip inside the Real Pen as well as a modulator and a transmitter. Once the tip touches the surface with the sensor, it creates its own magnetic field and energy — the reason why the Real Pen and Wacom’s other pens don’t require batteries or a power source. The surface has many antennae coils, keeping track of where the current is coming from. This, in turn, tells your computer what to do. Matter of factly, this is Wacom’s patented technology called electromagnetic resonance, or EMR. It's a great idea when you scribble, doodle or sketch something that you’d like to save for later. As How Stuff Works puts it, that’s better then doing it on a piece of paper than accidentally throwing it, right?