Creating a pen tablet from an optical mouse is technically challenging due to the fundamental differences in technology. An optical mouse consists of an optical component and a digital signal processor (DSP), which are not easily adaptable for pen tablet functionality. While separating the optical unit and DSP could allow for some movement tracking, it would not replicate the capabilities of a true pen tablet, such as absolute positioning and pressure sensitivity. A pen-mouse device exists that combines mouse sensor technology in a pen-shaped form, which may serve as a more practical alternative. Overall, transforming an optical mouse into a functional pen tablet is not feasible without significant limitations.